The FCL USB Pen Tablet Windows driver is a software package that enables your Windows computer to recognize and interact with a USB pen tablet (a type of graphics tablet) connected to your system. These tablets are commonly used for digital drawing, graphic design, and photo editing, where the user can draw or write directly onto the tablet with a pen-like stylus, and the computer interprets these movements into digital input.

The driver is important because it ensures that the pen tablet functions correctly with your computer's operating system, providing features like pressure sensitivity, tablet button mapping, and smooth input recognition.