Geometry Shaders are a type of shader used in computer graphics, specifically within the Graphics Pipeline. They take the output from Vertex Shaders and can generate new geometry, such as points, lines, or triangles. This allows for more complex shapes and effects to be created dynamically during rendering. These shaders operate on entire primitives, meaning they can manipulate and create multiple vertices at once. This capability is useful for tasks like adding detail to models or creating effects like billboards and shadows. Overall, Geometry Shaders enhance the flexibility and efficiency of rendering in 3D graphics.