These act as an index, telling your client which "pieces" to download from other users (peers) in the network. Why "Pieces" Matter

qBittorrent is a highly recommended open-source and ad-free choice.

Your client downloads different pieces from multiple peers at the same time, which significantly increases download speed.

Software like qBittorrent , uTorrent Classic , or Transmission.

After a piece is downloaded, the client checks it against a digital signature to ensure the data isn't corrupted or malicious.