A plane in geometry can be described as a flat, two-dimensional surface that extends infinitely in all directions. It is defined by any three non-collinear points, meaning the points cannot all lie on the same straight line.
To visualize a plane, think of a sheet of paper that goes on forever in all directions; no matter how far you extend it, it remains flat and without edges. In mathematical terms, planes are essential for many concepts in geometry, including angles, lines, and shapes, as they provide a foundational space in which these elements exist.