A "side" refers to a position or aspect of something, often used in discussions or arguments. It can represent a viewpoint, a faction, or a physical boundary. For example, in a debate, each participant may present their own side of the issue, advocating for their perspective. In geometry, a side is a straight line that forms part of the boundary of a shape. For instance, a triangle has three sides, while a rectangle has four. The number of sides helps define the type of shape and its properties, such as area and perimeter.