https://bigul.co/everything-you-need-to-know-about-demat-account-in-india
Investors initially used to open an account manually, which takes several days to activate, while online Demat account opening takes only 5 minutes.
A Demat Account, short for Dematerialisation Account, allows you to hold your shares and assets electronically. This makes online trading easier for users. Investments such as government bonds, stocks, exchange-traded funds, and mutual funds can all be kept in one Demat account.