A demat a/c stands for dematerialised account. Just as you have to open an account with a bank if you want to save your money, make cheque payments etc, you need to open a demat account if you want to buy or sell stocks. So it is just like a bank account where actual money is replaced by shares. You have to approach the DPs (Depository Participant is the agent of the Depository and is the medium through which the shares are held in the electronic form. They are also the representatives of the investor, providing the link between the investor and the company through the Depository.), to open your demat account.
