Surfaces refer to the outermost layer or boundary of an object, which can be smooth, rough, flat, or curved. They play a crucial role in determining how objects interact with their environment, affecting properties like friction, reflection, and absorption. For example, the surface of a mirror is smooth and reflective, while the surface of sandpaper is rough and designed for abrasion. In science, surfaces are studied in various fields, including physics, chemistry, and materials science. Understanding surface properties helps in applications like coating materials, designing nanotechnology, and improving adhesion in glue and tape.