A torrent client is a software application that enables users to download and upload files using the BitTorrent protocol. This protocol allows for the sharing of large files, such as videos, music, and software, by breaking them into smaller pieces. Users can download these pieces from multiple sources simultaneously, which can speed up the download process. Torrent clients also allow users to share their own files with others. When a user downloads a file, they can simultaneously upload parts of it to other users, contributing to the overall sharing network. Popular torrent clients include uTorrent, qBittorrent, and BitTorrent.