A geometric solid is a three-dimensional shape that has length, width, and height. These shapes can be classified into two main categories: regular solids, which have faces that are all the same size and shape, and irregular solids, which do not. Common examples of geometric solids include cubes, spheres, cylinders, and pyramids. Geometric solids can be studied in mathematics to understand their properties, such as volume and surface area. The study of these shapes is essential in various fields, including architecture, engineering, and art, as they form the basis for designing and constructing physical objects.