The rectangular cuboid, or just **cuboid**, is a three-dimensional shape that consists of six rectangles. Each rectangle is called a face. Every rectangular cuboid has six **faces** (The top and bottom faces are often called the top and bottom **bases** of the rectangular cuboid). It is important to understand that there are actually $3$ pairs of faces, and each face **will be identical to its opposite** face.

The straight lines formed by two intersecting sides are called **edges** (or sides). Every cuboid has $12$ edges.

The meeting point between two edges is called the **vertex**. Each cuboid has $8$ vertices.