A geometric shape is a figure formed by points, lines, curves, and surfaces in a two-dimensional or three-dimensional space. Common examples include circle, square, triangle, and rectangle in two dimensions, while cube, sphere, and cylinder represent three-dimensional shapes. These shapes can be classified as either regular, with equal sides and angles, or irregular, with varying dimensions. Geometric shapes are fundamental in mathematics and are used in various fields, including art, architecture, and engineering. They help in understanding spatial relationships and are essential for creating designs, structures, and models in the real world.