A file ending in .torrent is not the actual content (like a video or software) but a small metadata file. It acts as a "map" that tells your computer how to find and download pieces of the actual data from other users on a peer-to-peer (P2P) network.
are users who have the 100% complete file and are uploading it to others.
Your client connects to a "tracker"—a server that keeps track of which users have the file. Peers and Seeders: