A wall is a big flat thing made of bricks, stones, or other materials that is used to divide spaces or protect us from things we don't want to be around. It's like a big fence but it can be taller and stronger. Walls can be inside homes or buildings, or outside like around a yard or a city. They can also be painted or decorated to make them look pretty! Walls can keep us safe, give us privacy, and help keep things organized.