Okay, so imagine you and your friend are walking on a beach. Suddenly, you see a footprint in the sand. You can look at that footprint and tell a lot of things about whoever made it!
Now, imagine that instead of a person, you are looking at a footprint made by a dinosaur. A dinosaur footprint is called an ichnite. Paleontologists, scientists who study dinosaurs, can look at ichnites and learn a lot about what dinosaurs were like.
For example, they can see how big the dinosaur was, what kind of feet it had, and even how fast it was walking or running. By looking at many ichnites from different places, paleontologists can learn more about what dinosaurs did, where they lived, and how they moved around.