Almost every device you can buy today supports Bluetooth, but what is Bluetooth? Simply put, Bluetooth is a way for two nearby gadgets to transmit data to each other. Let’s take a look at what Bluetooth is, trace its roots, discuss its pros and cons, and find out how it differs from other common wireless technologies like Wi-Fi or NFC. What Is Bluetooth? Bluetooth is a wireless technology standard whose purpose is to connect gadgets without a cable.