We've seen that Orochimaru put cursed seals on some people like Sasuke, Sound Four and Anko. I never really understood why he did it. What did he get from it?

At first I thought that it had to do something with body compatibility, but the origin of the cursed seal is Jūgo, not Orochimaru.

Could someone explain better about the relation between Orochimaru and the cursed seals and why he put them on people?