@Vaibhavvd DDPI is not just Electronic Signature. It replaces PoA as per SEBI circular of 6Oct2022. DDPI limits the power of Brokers only to 4 categories whereas PoA used to provide Brokers absolute power with our accounts. SEBI brought DDPI when some broker misused POA to pledge and sold stocks without consent of a/c holders. You can google the story.
Refer the DDPI form: https://support.zerodha.com/category/account-opening/offline-account-opening/oq-offline-accounts/articles/demat-debit-and-pledge-instruction
For Zerodha, the whole process is cumbersome if we want to move from PoA to DDPI. First we have revoke PoA (this is online). Then the a/c will become eDIS type where TPIN will be required. This takes around 1 week. After that we need to again fill and send form offline to activate DDPI . This may also take couple of Days. After approval of DDPI, a/c type will become DDPI where TPIN will not be required.
So, am still thinking to DDPI shift due to long process. Also, our signature must match with the signature made during a/c opening. Otherwise already have shifted to DDPI. Hope Zerodha will make DDPI process online soon like Angle or Upstox.