A driver is a small software program that acts as a translator between your computer's operating system and a physical device. When you plug in a printer, graphics card, or webcam, the driver tells your OS how to send commands to that hardware and interpret its responses.
Every device connected to your computer needs a driver. Without one, Windows, macOS, or Linux won't know how to interact with it. Some devices ship with driver installation discs, but most can be downloaded from the manufacturer's website or installed automatically through Windows Update.
Drivers are often updated by manufacturers to fix bugs, improve performance, or add new features. For example, a graphics card driver update might unlock support for a new game or reduce power consumption in your laptop. Audio interface drivers might gain support for new sample rates, or printer drivers might add wireless printing capability.
Common driver types include: graphics drivers (for your GPU), chipset drivers (for your motherboard), network drivers (for WiFi or Ethernet), storage drivers (for SSDs), and peripheral drivers (for mice, keyboards, or external hard drives).
When buying a new device, check that drivers are available for your operating system. Windows and macOS usually handle driver installation automatically, but some older or specialist hardware requires manual setup. If a device has poor driver support, you may face crashes, missing features, or poor performance.