Both let you own a whole market cheaply; the difference is mostly how you buy and hold them. An index fund is a mutual fund you buy at the end-of-day price, ideal for automatic monthly SIPs and set-and-forget investing. An ETF trades on the exchange like a stock, so you buy it through a broker at live prices during market hours, which suits people who already have a demat account and want flexibility, but it can carry small trading costs and pricing gaps. For most busy founders, a plain index fund via SIP is the simpler, lower friction choice; an ETF is fine if you prefer exchange trading. Either way, favour broad, low cost options and resist the temptation to trade them actively.
3 resources, 2 India-specific, 2 link-checked.
The free, India-first walkthrough of what a mutual fund and an index fund actually are, direct vs regular plans, and how a SIP works.
From Zerodha Varsity by Zerodha Varsity
Open zerodha.com →The market regulator own free investor-education portal: unbiased basics on investing, mutual funds, and avoiding scams, with nothing to sell you.
From SEBI by SEBI
Open investor.sebi.gov.in →The canonical, no-hype reference on building a simple index portfolio and why costs and discipline beat cleverness.
From Bogleheads by Bogleheads
Open bogleheads.org →
