OpenGL (Open Graphics Library) is a cross-platform API for rendering 2D and 3D vector graphics. It is widely used in video games, CAD software, and simulation applications to create high-performance visual content. OpenGL provides a set of functions for drawing graphics primitives, such as points, lines, and polygons, and supports advanced features like shaders and texture mapping. With its hardware-accelerated rendering, OpenGL ensures smooth and high-quality graphics. It is particularly valued for its portability across different platforms and device configurations.