Aiseesoft Youtube Downloader Pro is a tool used to download videos from up to 150 video sites. These sites include YouTube, Google Video, Yahoo Video and many other video sites. Aiseesoft Youtube Downloader Pro supports protocols like http, rtsp, rtmp, and mms. After the download, this tool can automatically convert the vidoes to MP4, H.264, AVI, and MPEG. Generally, Aiseesoft Youtube Downloader Pro has three main functions. First, it downloads videos from famous video sites. Second, it converts the downloaded videos to lots of different video or audio formats. Third, it supports multi-downloading tasks and multi-threads that saves you time and amounts to a faster conversion process. Aiseesoft Youtube Downloader Pro has powerful editing functions that make sure you get quality output. It is fast, easy to use and is helpful to those who enjoy movies a lot. It is also for people who are fond of downloading videos from video sites either for business or personal use.