I Know how to post pictures and stuff but don't know how to do the animations... Can Anyone teach me how?
Graphics Interchange Format. Tiny clips of video almost, but they act like pictures in most cases, including signatures.
GIF are like pictures just the same way that JPGs or BMPs are pictures. The difference with GIF is that they allow you to animate them (essentially it's 1 file that contains multiple images) and that's why they're popular for signatures which do not otherwise allow video-like content in them.
Since it seems your question has been answered, I'm going to go ahead and lock this thread. Please pm me if you have a problem with that. Also, you can search up animated gifs just by adding the word gifs to your search. "cat gifs" will usually bring up a lot of animated pictures.