Bluetooth Low Energy (BLE, aka Bluetooth Smart) is a power-conserving variant of Bluetooth Personal Area Network (PAN) technology. As compared to Classic Bluetooth, Bluetooth Smart is meant to provide low power consumption and reduced cost. BLE uses wireless technology in the 2.4 GHz unlicensed radio band to connect to nearby devices.
In 2006, Nokia introduced Bluetooth Smart by the name Wibree. It was later on in 2010, the Bluetooth Special Interest Group (SIG) adopted the technology and merged it within the standard Bluetooth Core Specification version 4.0. BLE works on almost the same principles as Standard Bluetooth but consumes very low power for communication.
BLE consists of 2 roles –Peripheral (Slave) &Central (Master). A Peripheral device advertises, to let other devices know of its presence while the Central device sends a connection request to establish a connection.BLE uses two additional terms to describe the connecting entities: Server - the device that has information to share, that is typically the peripheral; Client - the device that seeks information and services, that is typically the central device - the phone.
Heart Rate Monitors, Locks, Smart watches, Wearable gadgets are good examples of BLE solutions.The opportunities presented by this technology are huge & endless and innovative things are being built around it every other day.