The terms gif, jpg, bmp and png are used as extensions for files that store

The extensions gif, jpg, bmp and png are all used for files that store image data.

Audio data is stored in formats such as mp3 and wav, not these.

Video data uses formats like mp4 and avi rather than these image types.

Text data is stored in formats such as txt and doc, not in image formats.

These formats differ in compression, colour depth and transparency support.

For example png supports transparency while jpg uses lossy compression for photos.