Corded
Traditionally, keyboards have had a cable that connects the keyboard to the computer using a USB port, hence a corded keyboard, and using a corded keyboard has its advantages.
Wireless
Wireless keyboards are either receiver-based or Bluetooth-based. Receiver-based keyboards connect to the computer via a nano receiver that plugs into a USB port.
Bluetooth
Bluetooth keyboards connect to your computer or other device via a Bluetooth connection. You can also use them with other Bluetooth-capable devices.