To begin with, we have to understand that, all being equal, a lot of bright dudes came up with different ways to do something. Specifically, wireless connectivity. Bluetooth itself is a great compilation of specifications, a wishlist of features and options that bundled together offers a easy to use wireless protocol.
What is Bluetooth?
Intended to replace wires for transferring information, Bluetooth evolved into a robust, mature and easy to use protocol. After the introduction of A2DP (Advanced Audio Distribution Profile) which is used for high quality audio transfer Bluetooth became capable of delivering the bandwidth necessary for great audio. Click here to learn more about setting up Bluetooth
It is fairly easy to deduce, even without any technical background, that Bluetooth speakers are some kind of speakers one can connect to wireless. And it is correct! Bluetooth is a wireless protocol established by some bright minds to help us leave the wires behind!