Slide-tape is like a funny kind of movie that you watch on a special machine. It's made up of a bunch of little pictures called slides that are put on a long strip of tape. When you put the tape into the machine and press the play button, the tape moves really fast and makes the slides go by really quickly, like you're watching a movie.
Each slide has a different picture on it, kind of like flipping through a book really fast. When you watch the slide-tape, it looks like the pictures are moving and telling a story or showing you something cool. You can pause the tape at any time to look at a slide more closely, too!
People used to make slide-tapes a lot when cameras didn't take videos, so it was a way to make movies out of pictures. Nowadays, most people use digital cameras to make videos instead, but slide-tapes are still fun to watch!