The edge of a cube is the line segment where two faces meet. Each cube has 12 edges, and all of these edges are equal in length. In more technical terms, if you take a cube that has sides of length a, then the length of each edge is also a.
To better visualize this, think of a standard die used in board games. Each side of the die is a square face of the cube, and the lines where those square faces meet form the edges. Understanding the concept of edges is crucial, especially in geometry and three-dimensional shapes, as it helps in calculating properties such as surface area and volume.