Geometry is the branch of mathematics that deals with shapes, sizes, and the properties of space. It encompasses various concepts, including points, lines, angles, surfaces, and solids. Geometry is essential in many fields, such as architecture, engineering, and computer graphics. It helps in understanding physical spaces and the relations between different shapes. Fundamental concepts in geometry include the study of triangles, circles, and polygons, along with more complex dimensions in higher geometry. Overall, geometry provides the tools necessary for exploring and analyzing the spatial aspects of both mathematical theory and the real world.