What is a tracker in Torrents?

A BitTorrent tracker is a service on the internet that assists in the communication between BitTorrent clients. When you open a torrent file, your machine contacts the tracker and asks for a list of seeds and leechers to connect to.

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A Bit Torrent tracker centrally coordinates the P2P transfer of files among users.
Tracker software serves up torrent files for download from a Web site. The tracker maintains information about all BitTorrent clients utilizing each torrent. Specifically, the tracker identifies the network location of each client either uploading or downloading the P2P file associated with a torrent. It also tracks which fragment(s) of that file each client possesses, to assist in efficient data sharing between clients.