What type of devices does not require device drivers to be manually installed?

The reason that plug-and-play devices do not require device drivers to be manually installed is due to the way they are designed to operate seamlessly with the operating system. These devices are equipped with a technology that allows them to automatically detect and configure themselves when they are connected to a computer. This automatic setup means that the necessary drivers for functionality are typically loaded by the operating system without user intervention.

In contrast, external hard drives often require drivers, especially if they are not recognized by the system automatically, and can depend on the operating system's existing support for such hardware. Legacy devices usually need specific manual installation of drivers, as they may not be compatible with modern operating systems. Wireless devices can vary, and often require drivers to be installed manually to connect and function properly with the desired network or services.

Therefore, plug-and-play devices provide a more user-friendly experience by eliminating the need for manual driver installation, streamlining the process of getting them up and running.