ABSTRACT
WiFi, which stands for Wireless Fidelity, is one of the most widely used wireless networking technology today with millions of them deployed in our homes, workplaces, airports, shopping malls, community parks, and university campuses. All personal mobile devices, such as smartphones, tablets, and laptops are fitted with WiFi interfaces, making them very easy to be connected to such networks wherever they are available. In most cases, WiFi is available for free to use or at least there is no limit imposed on the volume of data for paid subscriptions, making it the most desired and economical option to get connected to the Internet. This chapter explain the basic features and functions of the WiFi technology including the numbering convention used to refer to different generations of the technology, the spectrum bands and channels used for communications, medium access control, addressing and power saving. [131 words]
