exists and is an alternate of . Basically, it's a picture, but more specifically, it's something you stick on something else like a poster or a sticker. Basically, it's a picture, but more specifically, it's something you stick on something else like a poster or a sticker. A decal is simply a picture that can be used either as icons or images on bricks or it can be used for a poster when you veiw the game.  <br /> 