A mural is like a really big picture that someone paints on a wall. Imagine your favorite picture, but imagine it's so big that it covers a whole wall of a building! It's kind of like a huge painting that everyone can see as they walk by. Murals can be really colorful and beautiful, and they can even tell a story or share a message. People like to paint murals in different places, like on the side of a building or in a park. So if you see a big picture on a wall next time you're out, it might be a mural!