The Mac mini does not come with a keyboard or mouse. If you don't already have a keyboard or mouse, you can buy one that connects via USB or Bluetooth.
USB
The Mac mini has two USB 2.0 ports, which can be used with any USB 1.1- or USB 2.0-compliant keyboard and mouse.
The Apple USB Keyboard and Apple Pro Keyboard both contain a USB hub that allows you to connect a USB mouse and still have two free USB ports (one on the keyboard and one on the back of the Mac mini) for other USB devices. If you have a USB device that doesn't have its own power supply, you may want to connect it directly to the USB port on the computer rather than to the USB port on the keyboard.
Note: Some third-party USB keyboards may have different keys than an Apple keyboard.
Bluetooth
You can also order a Mac mini with an internal Bluetooth module that allows you to use an Apple Wireless Keyboard, Apple Wireless Mouse, and many other Bluetooth accessories. If you have a Mac mini without Bluetooth installed, you can purchase an internal module and have it installed, or you can use a USB Bluetooth adapter to enjoy wireless connectivity with Bluetooth-compliant devices.