Solid figures are three-dimensional shapes that have length, width, and height. They occupy space and can be measured in terms of volume. Common examples of solid figures include cubes, spheres, cylinders, and pyramids. Each of these shapes has unique properties, such as the number of faces, edges, and vertices. Solid figures can be classified into two main categories: prisms and pyramids. Prisms have two parallel bases that are congruent, while pyramids have a single base and triangular faces that meet at a point called the apex. Understanding solid figures is essential in fields like geometry and architecture.