According to Bluetooth.com there are two flavors of Bluetooth:
The two most prevalent implementations of the specification are Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR), which was adopted as version 2.0/2.1, and Bluetooth with low energy (LE), which was adopted as version 4.0/4.1/4.2. Each implementation has different use cases and each implementation uses a different chipset to meet essential hardware requirements. Dual-mode chipsets are also available for applications that include both use cases.
Brian discusses the different implementations of the Bluetooth classic or the latest “craze,” Bluetooth Low Energy, Bluetooth Smart, Bluetooth LE, BTLE, or BLE.