The CanoScan 8400F is a flatbed scanner made by Canon. It supports high-resolution scanning for documents, photos, and film. The Windows driver for the CanoScan 8400F is software that allows the scanner to communicate with a Windows computer. Without the driver, the scanner will not work, or you might not be able to use all of its features (e.g., high-resolution scanning or image processing software).
The driver typically includes: