Demat account is an account that is used to hold shares and securities in electronic format. The full form of demat account is a dematerialised account. A demat  account works just like a bank account, we use a bank account to receive and deposit money, we buy and register shares and sell them later through a demat account. As per SEBI Act, Demat account is required for all stock market related transactions like sale of shares, participation in initial public offering of companies.

Investors should open accounts through stock brokers and not directly. Account can be opened online or offline. Demat account can be opened with the help of any authorized stockbroking company approved by SEBI providing financial services to open demat account.

The PAN card is mandatory to open a demat account. An individual has to submit the PAN card to open the demat account.

That is not necessary, But your mobile number is needed to be linked with Adhar card

You we can open more than  one  Demat Account.

 There is no limit. One bank account will be the primary bank account and the others will be marked as secondary bank accounts.

Any government employee can open a demat account for stock investment, equity, mutual funds, and other transactions.

The difference between a demat and a trading account is that a demat account holds the shares and securities (bonds, ETFs, mutual fund units, etc.) in digital mode, while a trading account provides the interface to buy and sell shares in the stock market.