A depository helps to interact with investors through agents which are called Depository Participants (DPs). Investors who want to enjoy the services of depository in terms of buying & selling stock then they have to open an account with depository participants. A depository participant is an agent of depository through which it interfaces with investors & provides depository services. A depository is an entity that helps an investor to buy or sell securities like stock or bond. Depository Participant is a link between companies that issue securities & depositories.