Wi-Fi is Wireless Fidelity ie. cable-free projection00 and is based on the IEEE 802.11 standard for wireless local area networks developed by a working group of the Institute of Electrical and Electronics Engineers (IEEE). Will have four specifications in the family: 802.11, 802.11a, 802.11b and 802.11g. The four are used with Ethernet protocol and CSMA / CA to communicate.

Wi-Fi (802.11a): An IEEE specification for wireless networks operating at a frequency of 5GHz (from 5725 to 5850 GHz GHz) with a data transfer rate of 54Mbps. The frequency band of 5 GHz is not as crowded as the 2.4 GHz, because the 802.11a specification offers more radio channels that the 802.11b. These additional channels help to block the interference of radio and microwave.

Wi-Fi (802.11b): International standard for wireless networks operating in the frequency range of 2.4 GHz (2.4 GHz to 2.4835 GHz) and offers a way out of 11Mbps. This frequency is commonly used. Microwaves, cordless phones, medical equipment and scientific, and Bluetooth devices work with a band of 2.4 GHz frequency.

Wi-Fi is currently composed of several standards operating in different radio frequencies: 802.11b is a standard for WLANs operating in the 2.4 GHz spectrum with a capacity of 11 Mbps; 802.11a is a standard for WLANs operating in the 5 GHz frequency range with a capacity of 54 Mbps; 802.11g, is a standard for WLANs operating in the 2.4 GHz frequency but with a capacity of 54 Mbps.

Wi-Fi is used to support wireless radio frequency networks for business, home, and any application where wireless or mobile connections are desired.

Unless adequately protected, a Wi-Fi network can be susceptible to access from the outside by unauthorized users who can use the access as a free Internet connection or to access information! The activity of locating and exploiting security-exposed wireless LANs is commonly known as war-driving. Those using a WLAN are urged to add security safeguards such as the Wired Equivalent Privacy (WEP) encryption standard, virtual private network (VPN), and a firewall.

Wi-Fi 802.11b is currently the most popular wireless solution for projectors and small computer networks for home or office. It has a throughput capacity of 11 Mbps and an approximate range of 50 meters. Real data throughputs for all the wireless solutions are less than the capacity throughput due to communication overhead and synchronization issues. Wi-Fi 802.11b will deliver data at about 7 Mbps, which is more than 10 times the performance of Bluetooth.