A wedge is a simple geometric shape that tapers from a thick end to a thin edge, resembling a triangular prism. It is often used to separate objects or hold them in place. Common examples of wedges include tools like knives, axes, and doorstops, which utilize the wedge shape to apply force or create space. In geometry, wedges can be classified as two-dimensional or three-dimensional shapes. A two-dimensional wedge can be represented as a triangle, while a three-dimensional wedge resembles a triangular prism. Wedges are essential in various fields, including engineering and construction, where they help in lifting or splitting materials.