An encoder is a computer which uses software, such as Windows Media Encoder, to apply a compression/decompression (codec) algorithm and stream format to content that is in either analog or digital audio and video format and then reproduces the content as a digital file or stream. This process is referred to as encoding. Once the content has been encoded, it can be distributed by Windows Media Services. In most cases, the software used to encode the content is installed on a separate computer from Windows Media Services.