AV (audio/video) , an abbreviation for audio/video, is frequently used as a generic term for the audio and video components and capabilities in home entertainment system and related product descriptions and reviews.
The terms audio and video commonly refers to the time-based media storage format for sound/music and moving pictures information. Audio and video digital recording, also referred as audio and video codec’s, can be uncompressed, lossless compressed, or loss compressed depending on the desired quality and use cases.
Video codec’s will contain a sequence of frames, any still pictures and for compressed formats, movements between those pictures. Quality will vary depending on the number of frames per second, color space, resolution, etc