The Internet is a global system of interconnected computer networks that use the standard Internet protocol
suite (TCP/IP) to serve several billion users worldwide. It is a network of networks that consists of millions
of private, public, academic, business, and government networks, of local to global scope, that are linked by
a broad array of electronic, wireless, and optical networking technologies. The Internet carries an extensive
range of information resources and services, such as the inter-linked hypertext documents of the World Wide Web
(WWW), the infrastructure to support email, and peer-to-peer networks.
Wi-Fi, also spelled Wifi or WiFi, is a popular technology that allows an electronic device to exchange data or
connect to the internet wirelessly using radio waves. The name is a trademark name, and was stated to be a play
on the audiophile term Hi-Fi. The Wi-Fi Alliance defines Wi-Fi as any "wireless local area network (WLAN)
products that are based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards".
However, since most modern WLANs are based on these standards, the term "Wi-Fi" is used in general English as
a synonym for "WLAN". Only Wi-Fi products that complete Wi-Fi Alliance interoperability certification testing
successfully may use the "Wi-Fi CERTIFIED" trademark.