Bluetooth 4.0 is a wireless technology standard that allows devices to communicate over short distances. It was introduced in 2010 and is known for its low energy consumption, making it ideal for battery-powered devices like fitness trackers and smartwatches. This version supports data transfer rates of up to 25 Mbps, enabling faster connections and improved performance. One of the key features of Bluetooth 4.0 is its ability to connect to multiple devices simultaneously. It also includes improved security measures, ensuring that data exchanged between devices remains safe. Overall, Bluetooth 4.0 enhances the user experience by providing reliable and efficient wireless communication.