Flatness refers to the quality of being level or even, without any bumps or irregularities. In geometry, a flat surface is one that lies in a single plane, meaning it has no curvature. Common examples of flat surfaces include a tabletop or a piece of paper. In everyday life, flatness is important for various applications, such as construction and manufacturing. A flat foundation is crucial for building stability, while flat materials are often easier to stack and store. Understanding flatness helps in creating functional and efficient designs in both art and engineering.