2. Demat Account: A demat account allows a person to hold the shares in dematerialized form i.e. electronic form. The demat account should be linked to your trading account. The demat account is required to receive/transfer shares when you buy/sell shares through your trading account. 3.Bank Account: The bank account should be linked to your trading account.. Demat Account: A demat account allows a person to hold the shares in dematerialized form i.e. electronic form. The demat account should be linked to your trading account. The demat account is required to receive/transfer shares when you buy/sell shares through your trading account. 3.