Investing
Index fund
A fund that simply copies a market index like the Nifty 50 instead of trying to beat it.
An index fund buys the same stocks as a market index, in the same proportion. A Nifty 50 index fund just holds India's 50 biggest companies.
There is no star manager trying to pick winners, so fees are very low. You get whatever the market gives, minus a tiny cost.
Boring is the feature. Most active funds fail to beat their index over the long run, so matching the market cheaply is a genuinely smart default.
For example
A Nifty 50 index fund with a 0.2% expense ratio gives you the whole Indian large-cap market for almost nothing in fees.