Question: What is the difference between Wi-Fi and Bluetooth?

Both Wi-Fi and Bluetooth are wireless technologies that transmit data by using radio signal, the main difference between these two:

Wi-Fi is mainly used to provide wireless networking and Internet connection between wireless devices with bigger coverage and high bandwidth (such as wireless network to share Internet connection), whereas Bluetooth is normally used to provide ad-hoc voice/data transfer between mobile devices within short range and low bandwidth (voice transfer between wireless headset and cell phone or data transfer between PDA and laptop).