What is the difference between a photo and still photography?

A digital still camera creates files each of which contain a single image, and can be printed onto paper, if you want.

A digital video camera creates a file that consists of many sequential images which, when played back at the appropriate speed, look like moving images (as on TV or in the movies). You might be able to print a single image from that file if you had the right software, but you could not, and would not want to, print the entire file.