Bluetooth is a wireless technology that uses short-wavelength ultra high frequency (UHF) radio waves to transmit data over short distances. It was invented by telecommunications company Ericsson in 1994, and it is used by millions of people around the world on a multitude of devices that include smartphones, speakers, desktop computers and, of course, laptops like your MacBook.
However, Bluetooth should not be confused with Wi-Fi, as they are two completely different wireless technologies. Bluetooth is ideal only for exchanging information between two devices that are near each other, such as your iPhone and your MacBook when placed on your desk. Wi-Fi, on the other hand, is best if you want a faster speeds and the ability to connect even at far distances.