A driver in a computer is a special type of software that allows the operating system to communicate with hardware devices such as printers, graphics cards, keyboards, Wi-Fi adapters, and sound cards. Without drivers, the computer may not recognize or properly use the hardware.

Each hardware device usually requires its own driver so it can function correctly and perform all its features. For example, a graphics driver helps the operating system display images and videos properly, while a printer driver enables the computer to send print commands to the printer. Keeping drivers updated is important for better performance, compatibility, and system stability.