Image sequences commonly use PNG, TIFF, EXR or another still-image format. A consistent filename pattern and frame numbering let an editor import many files as one clip at a defined frame rate.
Sequences can preserve high-quality edges and alpha data without relying on a transparent video codec. They create many files and require complete numbering, adequate storage and explicit frame-rate settings to avoid gaps or incorrect playback speed.
ELI5
An image sequence is a folder of numbered pictures where each picture is one animation frame. Playing the pictures quickly in order produces the moving image.
For example, 300 transparent PNG files imported at 30 frames per second create a ten-second clip. The method preserves clean transparency, but one missing file can cause a visible gap and the editor must use the intended frame rate.
