This tool is used to convert Audio Video Interleave (avi) to Matroska Multimedia Container (mkv).

AVI is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows software. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback.

MKV is a free, open standard container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file.