Surfaces are the outermost layers of objects that we can touch and see. They can be smooth, rough, flat, or curved, and they play a crucial role in how we interact with the world. For example, the surface of a table is typically flat, making it suitable for placing items, while the surface of a ball is curved, allowing it to roll. Different materials have unique surfaces, which affect their properties and uses. A glass surface is smooth and transparent, while a sandpaper surface is rough and designed for smoothing other materials. Understanding surfaces helps us choose the right materials for various tasks.