TPIN stands for Transaction Personal Identification Number, and it is a six-digit password that is used to authorize the withdrawal of selected shares from a customers demat account with the CDSL depository. TPIN is an alternative to the Power of Attorney (PoA) given to the broker by the customer at the time of account opening, and it replaces the PoA altogether. As per the CDSL regulation, non-DDPI/POA customers must utilize the CDSL TPIN and OTP to authorize the debit of securities from their demat account for delivery sale transactions. With a CDSL TPIN, clients can pre-authorize the sale of their stocks at the beginning of each trading day, eliminating the need to do it for every delivery sell order placed during the day. To generate a new TPIN, clients can follow the steps provided by CDSL, which include entering their 16-digit demat ID and PAN, entering the captcha, and entering the OTP received on their registered email and number.