MOV is a video format with huge volume, which can well preserve the original image quality and bring alpha channels. So it is more used for materials. In fact, it is possible without him. MP4, MPEG, flv, etc. Can replace it. If it is not dynamic, a picture can be substituted. The relationship between AE and MOV, just like the relationship between pictures in png format and PS, is the relationship between software and material, so there is no MOV, which does not affect the production of AE. Any non-editing software or video special effects software such as AE can output MOV format.