What Is Bluetooth? A Complete Guide for 2025

Think back to the last time you connected wireless headphones, shared files between devices, or used a smartwatch. Chances are, Bluetooth made it possible. But while it’s a technology we use daily, many still ask: what is Bluetooth, and how does it actually work?

This guide explains Bluetooth in simple terms, covering its definition, advantages, use cases, security risks, and future role in an increasingly connected world.

Understanding Bluetooth Technology

Bluetooth is a wireless communication technology that allows devices to exchange data over short distances without the need for cables. It was first introduced in 1998, and since then, it has become a global standard for wireless connectivity.

The name “Bluetooth” comes from King Harald “Bluetooth” Gormsson, a 10th-century Viking king known for uniting Denmark and Norway — a fitting metaphor for a technology that unites devices.

Over the years, Bluetooth has evolved significantly, with versions ranging from Bluetooth 1 ...