Intel Haswell HD Graphics - GT1 Windows Driver
The Intel Haswell HD Graphics - GT1 driver is software that allows your operating system (Windows) to communicate with and take advantage of the integrated graphics processor found in Intel Haswell processors. The "GT1" refers to a lower-tier version of Intel's integrated graphics solution in the Haswell architecture (4th generation Intel Core processors). It supports basic graphics functions like video playback, general 2D/3D rendering, and light gaming, but isn't as powerful as higher-end integrated graphics models (e.g., GT2 or GT3).

The driver helps ensure that the graphics card functions correctly with the operating system, allowing you to run graphics-intensive applications, games, and video without issues.