eMule is a free peer-to-peer file sharing application for Microsoft Windows. Started in May 2002 as an alternative to eDonkey2000, eMule now connects to both the eDonkey network and the Kad network. The distinguishing features of eMule are the direct exchange of sources between client nodes, fast recovery of corrupted downloads, and the use of a credit system to reward frequent uploaders. Furthermore, eMule transmits data in zlib-compressed form to save bandwidth.eMule is one of the biggest and most reliable peer-to-peer file sharing clients around the world. Many developers contribute to the project, so the network gets more and more efficient with every new version.

The new eMule 0.50a (7 April 2010) introduces a new algorithm to verify downloaded files. This improves download speed as it reduces the number of corrupt parts. It also works better in Windows 7 and improves the interface making it easier to use.