Okay kiddo, have you ever drawn a picture on a piece of paper or carved your name into a tree? Think of that but a lot bigger and made out of rock. That's what a rock relief is!
Basically, it's when people carve pictures or designs into big rocks. Sometimes they are just simple things like animal shapes, but other times they are really detailed and show entire stories or historical events.
People have been making rock reliefs for a looong time - like thousands and thousands of years! Some of the oldest ones were made by ancient civilizations in places like Egypt and Persia.
Today, you can still see rock reliefs in lots of places around the world. Some are really famous and people travel from all over just to see them. So, next time you go on a hike or visit a historical site, keep an eye out for any cool rock carvings!