To access Wi-Fi hotspots, computers should include wireless adapters. Modern smartphones and tablets are also able to turn into Wi-Fi hotspots, using their cellular network connections to provide wireless internet connectivity to computers and other devices. An interconnected area of hotspots and network access points is known as a hot zone. Many charge a daily or hourly rate for access, but some are free. Many airports, hotels and fast-food facilities offer public access to Wi-Fi networks. Wi-Fi is widely used in businesses, agencies, schools and homes as an alternative to a wired LAN. This signal is then transmitted from the adapter through a router, after which it is sent to the internet. Wi-Fi's signals are transmitted in frequencies of between 2.5 and 5 gigahertz (GHz). These waves are different from those emitted by, for example, FM radios, for which frequency is measured in megahertz (MHz). A computer utilizes a wireless adapter to translate data transmitted by radio waves. How does Wi-Fi work?Ī Wi-Fi network uses radio waves to wirelessly transmit information across a LAN, the reach of which can be extended by a Wi-Fi range extender. Wi-Fi is a term for certain types of wireless local area networks ( WLAN) that use specifications in the 802.11 family - for example, Wi-Fi Direct, a peer-to-peer specification that allows devices certified for Wi-Fi Direct to exchange data without an internet connection or a wireless router. Products that pass Wi-Fi Alliance tests for interoperability, security and application-specific protocols are labeled "Wi-Fi CERTIFIED," a registered trademark of the Alliance.