Aria2 is an open-source client/server-based P2P application. It was created to be used as a general-purpose client for downloading files from other peers. The application supports various protocols such as BitTorrent, Gnutella, and eDonkey. The protocol-specific clients for BitTorrent are already present in the application.

Aria2 is known for its user-friendly interface and it provides numerous options to assist the user to select the desired settings. It also allows the user to specify the download limit for each protocol. The user can also select the resume function for the protocol.

Aria2 can be used to download files from a server in the most efficient and fastest way. It also allows the user to specify the desired settings like maximum peers, maximum file size, etc.