3-point lighting: The standard method of lighting a video subject, using a key light, a fill light, and a back light.

Analog: Describes data flowing in a continuous, often variable manner.

Artifacts: Lines, distortion, snow, or other unwanted data in a video image usually introduced by poor-quality equipment. Artifacts can appear in audio as odd sounds, dropouts (missing sound), or distortion.

Aspect ratio: The ratio of width to height of a video frame. Common ratios are 4:3 and 16:9.

ASP: Active Server Page.

ASX: The Microsoft Windows Media Services metafile file type.

Authentication: A process that ensures a user is authorized to access a file or service.

AVI: Audio Video Interleaved. A standard uncompressed or compressed video format ...

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