etc. Found in the first hit by putting"wi-fi" into a search engine.
Come on now don't be lazy, a lot of people put a lot of time and effort writing it so people have an easy to access resource for answering simple broad questions.
Wi-Fi is the technology used in a wireless network. Wi-Fi is loosely based on the IEEE standards for 802.11. Wi-Fi comes from the Wi-Fi Alliance and uses over lapping technology that is similar to the 802.11 standards. With the right setting a wireless network can be just as secure as a wired network. The only real disadvantage to a wireless network is the possibility of interference from outside sources.