Wi-Fi (Wireless Fidelity) is the technology that allows a desktop-computer, laptop, mobile phone or tablet to connect to local internet without the need for a physical wired connection. A transmitter, ‘hub’ or router, linked to a power supply and your phone line, is required to receive the information from the internet, convert it into radio waves and emit it, allowing your devices to receive these signals. Wi-Fi stands for Wireless Fidelity (remember Hi-Fi!).