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    What is an Index Fund? How It Works, Benefits, and Index Funds vs. Actively Managed Funds

    Last Updated On 16-06-2026

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    If you have spent even five minutes reading about investing, you have probably seen people talking about index funds as if they were some magical cheat codes for building wealth. And, there is a reason for that.

    For years, investors have been trying to beat the market by picking the right stocks, timing entries and exits, and chasing the next big thing. Some succeed. Most don't. That is where index funds come in. They offer a much simpler way to invest without spending hours on studying balance sheets or watching stock market news daily.

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    But what is an index fund? How does it work? Why do so many financial experts recommend them? And when it comes to index funds vs actively managed funds, which one makes more sense for an average investor? This guide will discuss everything you need to know!

    What is an Index Fund?

    An index fund is a mutual fund or exchange-traded fund that attempts to replicate the performance of a market index. There are a lot of types of index funds; however, the types are not important as long as you know and understand the basics.

    A market index is an investment instrument that holds companies. For example, the Nifty 50 has the 50 biggest companies in India. The Sensex holds 30 companies. In the United States, the S&P 500 has the 500 largest companies.

    So, instead of analysing each company to decide which of them performs better than others, index funds simply invest in all companies in an index.

    For instance, if Company A comprises 10% of the total index, then 10% of the fund's assets go into it. If company B contributes 5% to the index, 5% of the total goes into it and so on.

    How Does an Index Fund Work?

    Imagine you want exposure in the biggest companies in India. You could buy shares of 50 companies in the Nifty 50 individually. But that would take time, research, and quite a lot of money, also.

    An index fund does this work for you. When you invest in a Nifty 50 index fund, your money gets distributed across all companies within that index according to their weightage.

    If Nifty rises by 10%, the index fund will generally rise by a similar percentage, minus a small fee called the expense ratio. The fund manager never trades stocks actively or tries to make more money. The only thing he’s supposed to do is make sure that the fund's portfolio corresponds or is in sync with the index it follows. This approach is called passive investing. And that is one of the biggest reasons why index funds are considered safe investment vehicles around the world.

    Why Index Funds Became So Popular?

    A lot of investors eventually realize something surprising. Beating the market consistently is an incredibly difficult thing. Many professional fund managers with years of experience, expensive research teams, and advanced tools still struggle to outperform market benchmarks over long periods.

    So investors started asking different questions. Instead of trying to beat the market, why not simply own the market? It was a starting point for the idea of passive investing and helped to boost the development of index funds around the world.

    Benefits of Index Funds

    Here are some of the main benefits of index funds for investors:

    1. Lower Costs

      Index funds have very low investment costs and expense ratios. The reason is very simple: they are easy to manage and don’t require much research or stock-picking.
    2. Instant Diversification

      Arguably, the most obvious benefit of index funds is diversification. Instead of relying on just one or two stocks for the investment, one can enjoy diversification with dozens and even hundreds of businesses involved. The lack of reliance on individual securities reduces risks as compared to individual investments.
    3. Convenience

      Not everyone has the time or desire to analyse financial statements every weekend. But that is perfectly normal. With index funds, one can participate in market dynamics without being an expert on stock markets. Just invest regularly, stay invested, and enjoy the ride. Simple enough.
    4. Consistent Growth in the Stock Market

      It's impossible to tell which stock will turn out to be a multibagger next year. But through index investing, you are able to catch the general market dynamics. Historically, broad-market indices showed excellent growth despite all sorts of short-term fluctuations in the market.
    5. Minimising Human Bias

      Investors tend to make irrational decisions. Panic in a crash, greed in a bull run – you name it. With index investing, most decisions on what to invest in are predetermined by the chosen index.
    6. Transparency

      An index fund investor knows what they are getting into. There is public information about the underlying index. In terms of investment product transparency, it is better than many others.

    What Are Actively Managed Funds?

    Now that we have discussed what index funds are and how they work, let's talk about their counterparts. What are actively managed funds? Well, as one would guess, actively managed funds are investment products whose managers actively choose securities in order to outperform a chosen benchmark.

    Unlike the case of index investing, here, the job is done using extensive research and analysis of industries and the market in general. The aim here is rather simple: to earn more than the market. It does happen sometimes. But not always.

    Actively managed funds provide great opportunities, but at the same time, there are additional costs and risks involved.

    How Actively Managed Funds Work?

    Imagine that a fund manager feels that next year's best-performing sector will be banks, rather than technology. So, he or she decides to increase exposure in the banking sector and reduce the stake in tech companies.

    If they are right, then performance may well outshine the market performance. But if they are mistaken well, you get the idea.

    This constant buying, analysing, selling, and adjusting to the new market situation are the fundamentals of actively managed investment.

    As you can see, the success of actively managed funds is highly dependent on human decisions. And human decisions are not always flawless.

    Index Funds vs. Actively Managed Funds

    Here are some of the main differences that index funds and actively managed funds have:

    • Investment Strategy: Index funds follow the strategy of passivity. Active funds follow the strategy of activeness, with decisions made based on fund managers' views and market forecasts.
    • Objective: Index funds strive to match market returns. Active funds try to outperform the market.
    • Costs: Expense ratios are usually lower for index funds. As opposed to that, actively managed funds involve higher costs due to higher managerial costs and higher portfolio turnover.
    • Risk Levels: With index funds, there is only market risk. Actively managed funds include both market risk and the risk associated with fund managers making poor decisions.
    • Transparency: Index funds' transparency is higher since there is a clearly stated benchmark to be followed. Active funds may often not be entirely transparent, as their composition changes constantly due to active portfolio management.
    • Consistency of Performance: Some active funds may demonstrate excellent performance for some periods of time. But replicating it consistently throughout the years is extremely hard to achieve.

    Which Performs Better?

    This is probably the question that everyone wants answered. The truth is a little less exciting than what people expect. Some active funds outperform. Some underperform. Some do exceptionally well for a few years before falling behind.

    Research from multiple global markets repeatedly showed that a significant percentage of active funds fail in outperforming their benchmark indices over long periods after accounting for fees.

    That is not because fund managers are not skilled. Markets are just incredibly competitive. Every professional investor is trying to find the same opportunities. As a result, generating superior returns consistently becomes very difficult.

    Index funds, on the other hand, do not promise to beat the market. They simply aim to deliver market returns efficiently. For many investors, that is more than enough.

    Things to Consider Before Investing

    Before investing in any fund, it is important to consider:

    • Your financial goals
    • Investment horizon
    • Risk tolerance
    • Expense ratios
    • Fund size
    • Tracking error
    • Historical consistency

    And remember, no investment decision should be based only on recent performance. Markets move in cycles. Long-term thinking usually matters more than short-term results.

    Final Thoughts

    So, what is an index fund? Index funds are funds that allow you to invest in the whole market, without looking for particular companies to make a profit on.

    The increasing popularity of index funds has been fueled not only by marketing. This phenomenon can be explained by simplicity, diversification, low cost, and growth with the market.

    It is important to understand that when talking about index funds vs. actively managed funds, we can hardly speak about a definite winner. Both investment strategies have different roles.

    For some investors, especially those who build up their capital over many years, index funds can become a preferred option due to the mentioned advantages.

    In some cases, the process of investing does not require special skills and knowledge. It is often better to keep your investments and continue working hard. PNB MetLife offers multiple investment options to grow your wealth. Visit our website and browse from our available offerings now!

    FAQs on Index Funds

    Expand All Collapse All

    Can I start investing in index funds with a small amount? 

    Yes. Most index funds allow investments through SIPs, so you can start with a relatively small amount and gradually increase your contributions as your income grows.

    Do index funds pay dividends?

    Some index funds distribute dividends earned from the underlying companies, while others automatically reinvest them back into the fund. It depends on the fund's structure.

    How long should I stay invested in an index fund?

    Index funds generally work best when held for the long term. Staying invested for at least 5–10 years gives your money more time to benefit from market growth and compounding.

    Can I lose money in an index fund?

    Yes. Index funds move with the market, so their value can fall during market downturns. However, long-term investors have historically benefited from staying invested through market cycles.

    How do I choose the right index fund?

    Look at factors such as the benchmark index it tracks, expense ratio, tracking error, fund size, and the fund house's track record before making a decision.

    Disclaimer:

    The aforesaid article presents the view of an independent writer who is an expert on financial and insurance matters. PNB MetLife India Insurance Co. Ltd. doesn’t influence or support views of the writer of the article in any way. The article is informative in nature and PNB MetLife and/ or the writer of the article shall not be responsible for any direct/ indirect loss or liability or medical complications incurred by the reader for taking any decisions based on the contents and information given in article. Please consult your financial advisor/ insurance advisor/ health advisor before making any decision.

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