High-Level Shader Language (HLSL) is a programming language used to create shaders for graphics processing units (GPUs). It is designed to provide a way to write flexible and efficient shaders that can be used in video games, animations, and other real-time interactive graphics applications. HLSL provides access to advanced features of modern GPUs, such as texture sampling, lighting calculations, and vertex transformations. It is an important skill for graphics programmers, game developers, and other professionals who work with real-time 3D graphics.