VDA is the German Quality Management System (QMS) for the automobile industry (Verband des Automobilindustrie e. V.). The fourth edition was issued in December 1998, and became mandatory for all German car makers on April 1, 1999.

Variable Digital Amplifier. This is a functional block that controls volume.

Stands for Video Distribution Amplifier. A VDA is a device that typically has one input and multiple outputs, so you can display the same picture on multiple screens, such that interference to one output will not affect others.