Wi-Fi or WiFi is a technology for wireless local area
networking with devices based on the IEEE 802.11 standards. Wi-Fi is a
trademark of the Wi-Fi Alliance, which restricts the use of the term Wi-Fi
Certified to products that successfully complete interoperability certification
testing.
Devices that can use Wi-Fi technology include personal
computers, video-game consoles, smartphones, digital cameras, tablet computers,
digital audio players and modern printers. Wi-Fi compatible devices can connect
to the Internet via a WLAN network and a wireless access point. Such an access
point (or hotspot) has a range of about 20 meters (66 feet) indoors and a
greater range outdoors. Hotspot coverage can be as small as a single room with
walls that block radio waves, or as large as many square kilometres achieved by
using multiple overlapping access points.