India, Sept. 1 -- There's a good chance many younger investors were ordering off Zomato long before they understood what an IPO was. Same with Nykaa, probably. They used the app for months, maybe years, before the company even thought about going public. Then one day there's a headline saying it's happening, and the idea prompts a double-take: wait, I can actually own a piece of this now?

That's one reason IPO investing has grown among younger investors. An IPO, or Initial Public Offering, just means a company is selling a small chunk of itself to the public for the first time and getting listed on the stock exchange, a marketplace where these chunks, called shares, get bought and sold every single day. Before an IPO, only a handful of i...