DP stands for depository participants. India has two depository participants: CDSL or NSDL. Online forms will ask for a DP name. This indicates whether or not your account has been created using CDSL or NSDL. The 16-digit DP number can be used to identify your DP name. CDSL uses a 16-digit ID number whereas NSDL uses an alphabetical combination of the first two alphabets as well as the remaining 14 digits.