An extensible container format designed to store synchronized multimedia data.
analog
The traditional format in which audio and video are transmitted by using a wave or analog signal. An analog signal may not work with digital speakers; computers use digital signals.
announcement
A Windows Media metafile that gives a player the information needed to receive content. Announcement files contain Extensible Markup Language (XML) scripts.
aspect ratio
The ratio of the width of an image to its height.
attribute
A name-value data pair.
Audio Video Interleaved (AVI)
A multimedia file format for storing sound and moving pictures in Resource Interchange File Format (RIFF).
authentication
The process of verifying that an entity or object is who or what it claims to be. For example, a user name and password may be used to authenticate a user. See also: authorization
authorization
The process of granting access to protected resources. See also: authentication