Shapes are a fundamental concept in mathematics and design. They are two-dimensional or three-dimensional forms with specific characteristics, such as lines, curves, and angles. Shapes can be geometric (e.g., squares, circles, triangles) or non-geometric (e.g., free-form shapes). They are used in various fields, including art, architecture, engineering, and mathematics. Shapes can be classified into different types based on their properties, such as symmetry, dimensions, and complexity. Understanding shapes is essential for solving problems in geometry, spatial reasoning, and visual arts. Shapes are also used in everyday life, from design and construction to computer graphics and gaming.

A "shape" refers to the outline or boundary of an object, defined by lines and curves, which can be classified based on its properties like number of sides and angles; common examples of shapes include circles, squares, triangles, rectangles, and more, with basic shapes being considered "geometric" while irregular forms are called "organic" shapes.

Key points about shapes:

2D vs 3D:
Shapes can be two-dimensional (flat, like a circle on paper) or three-dimensional (solid, like a cube). 

Geometric shapes:
Regular shapes with predictable attributes like squares, triangles, and circles. 

Organic shapes:
Irregular shapes often found in nature, like the outline of a leaf or a cloud. 

Properties of shapes:
Defined by features like number of sides, angles, and symmetry. 

Examples of basic shapes: