The Intel i815 is a chipset that was introduced by Intel in the early 2000s. It was primarily used for Intel's Pentium III and Pentium 4 processors, offering support for integrated graphics, memory, and peripheral I/O functions. The chipset also provided various features like integrated audio and Ethernet support in many motherboards, especially for entry-level or budget systems at the time.

The Intel i815 Windows driver refers to the set of drivers that enable the Windows operating system to properly interface with the components controlled by the Intel i815 chipset. These components include integrated graphics, audio, and networking functions. Installing the correct driver is crucial for system stability and performance, especially if you're using an older PC with this chipset.