Is FTP a push or pull protocol?

Could you please clarify for me whether FTP, or File Transfer Protocol, operates as a push or pull protocol? I'm trying to understand the mechanics behind how it transfers files from one location to another, and whether it's initiated by the sender or the receiver. It would be greatly appreciated if you could explain the difference between push and pull protocols in the context of FTP as well, to give me a better grasp of the technology.