Learn in the textbookHow Video Works and Its File Formats
DefinitionAVI is a container format (コンテナ形式) that stores video and audio together in one file, with the extension .avi.
ExplanationA container format is a set of rules for a "container" that holds already compressed video and audio data as a single video file. AVI is a long-standing format that Microsoft created for Windows, and it does not fix which coding method the video inside must use.
AnalogyIt is like a moving box. You can choose the box and the way you fold the things inside separately.
Memory hookIn Audio Video Interleave, "interleave" means to slot things in alternately. The way it stores video and audio in small alternating chunks gave the format its name.