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AAC

Stands for Advanced Audio Coding, a type of digital compression that is used to reduce the size of music files while maintaining quality. AAC, which is the preferred method of digital encoding for Apple Computer and its line of iPod players, is superior in quality to the MP3 format but still part of the MPEG specification. See also MPEG, MP3.

ActiveSync

A program from Microsoft that synchronizes data between a PC and portable devices running the Windows Mobile or Windows CE operating system.

aggregator

A piece of software that scours specific areas on the World Wide Web to find selected content and then deliver it to your computer.

audio blog

A Web log (blog) that contains audio files instead of written text.