What is the difference between Bluetooth Classic and Bluetooth Low Energy?

Difference of Bluetooth® Classic and Bluetooth LE

Bluetooth® is a long range wireless networking protocol (like WIFI) designed to quickly and automatically connect devices like printers, PDAs, Cameras etc to computers and to each other without wires. It can be used to connect cell phones to each other to exchange pictures, ring tones, music etc; connect computer peripherals like mice, keyboards, printers etc to a computer and connect headsets to mobile phones for hands free operation (Bluetooth car kits). Bluetooth devices automatically detect and contact each other making communication between devices very easy. The current version of Bluetooth has 2 flavors: Bluetooth Classic and Bluetooth Low energy.

Bluetooth Classic is ideal for connecting cell phones to Bluetooth headsets for phone calls
Bluetooth Low energy is an ultra-low power version of Bluetooth meant for low power sensors and accessories. It is ideal for applications that do not require continuous connection but depend on long battery life. It is not suitable for streaming audio but for e.g. remote controls.