What is this? Wi-Fi Wireless networking with Bluetooth?

Wifi and bluetooth are 2 different radio/wireless communication tools. Where wifi is a wide area network bluetooth is a personal area network. Short range of about 30 ft.

Bluetooth in a laptop is most commonly used to wirelessly attach to mice, printers or slide projectors for presentations. They could also connect to any other bluetooth device such as phones, stereo receivers, speakers, head phones, hand held GPS units, NAV gear on a boat such as a chart plotter, NIKE fuel bands, etc...

You use the bluetooth to connect peripherals (keyboard,mice,speakers, etc) or to transfer files between the laptop and your phone for example. If you know they're different types of wireless signals and not related then that's all you need to know.