It’s a peer to peer network so all of the members of the network contribute to the network or take from it seeders and leechers, seeders are uploading the data, leachers are downloading it. When you download a file from a website you are downloading information about the torrent, things like the Tracker (announce), information about the files being shared, including things like the size, and the names of the files. This is why you can download a .torrent file or you can use something like a magnet link like the following.
Trackers are servers that host information about the torrent and the peers. The trackers basically just tell your torrent client “hey these peers are interested in sending the file to you and here is how you connect to them” or “hey these peers are interested in downloading the file to you and here is how to connect to them”. They don’t host the file, they only have information about the torrent and the peers.
Your torrent client (I simp for Deluge, Transmission, and qBitTorrent) is the piece of software in that negotiates the connections between peers and your computer, and facilitates the downloading or uploading the file from/to the network along with keeping track of the trackers available to you.
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