WLAN (Wireless Local Area Network) technology is what Wi-Fi is. It offers short-range wireless high-speed data connections between local Wi-Fi access points and mobile data devices (such as laptops, PDAs, or phones) (special hardware connected to a wired network).
802.11g, an earlier version of Wi-Fi, is backwards compatible with 802.11b and can deliver rates of up to 54Mbps (providing up to 11Mbps).
The more modern specification is known as 802.11n (offering speeds of up to 150Mbps per channel or up to 600Mbps in total). It may be utilised in either the 2.4 GHz or 5 GHz frequency bands, however to use both, a receiver needs a dual-band antenna.
The most recent (as of now) Wi-Fi ac standard was created in 2013. It permits channel speeds of up to 500 Mbps and overall rates of more than 1Gbps. Wi-Fi 802.11ac exclusively uses the 5GHz spectrum for operation.
Wi-Fi is significantly quicker than any cellular network-based data protocols, including GPRS, EDGE, UMTS, and HSDPA.
A Wi-Fi access point’s inside coverage range is between 30 and 100 metres, and its outside coverage range is between 650 metres and 650 metres.