How WI-FI technology works

Technology has improved in sharing the data from one point to another. This let to the evolution of  Networking. Network are nothing but transfer of files from one Node to Another Node through some Physical medium like cable. WI-FI are latest technology that do not require any physical medium to transfer data. Let see more of it inside

Wi-fi refers to wireless networking, and is sometimes mentioned as 802.11.
802.11 is the standard designation of wireless networking given by IEEE

A wireless network uses radio waves, just like cell phones, televisions and radios do.
   1. A computer's wireless adapter translates data into a radio signal and transmits it using an antenna.
   2. A wireless router receives the signal and decodes it. The router sends the information to the Internet using a physical, wired Ethernet connection.

    They transmit at frequencies of 2.4 GHz or 5 GHz. This frequency is considerably higher than the frequencies used for cell phones, walkie-talkies and televisions. The higher frequency allows the signal to carry more data.

  
          * 802.11a transmits at 5 GHz and can move up to 54 megabits of data per second. It also uses orthogonal frequency-division multiplexing (OFDM), a more efficient coding technique that splits that radio signal into several sub-signals before they reach a receiver.

          * 802.11b is the slowest and least expensive standard. For a while, its cost made it popular, but now it's becoming less common as faster standards become less expensive.  transmits in the 2.4 GHz frequency band of the radio spectrum.

          *802.11g transmits at 2.4 GHz like 802.11b, but it's a lot faster -- it can handle up to 54 megabits of data per second. 802.11g is faster because it uses the same OFDM coding as 802.11a.

          * 802.11n is the newest standard that is widely available. This standard significantly improves speed and range. For instance, although 802.11g theoretically moves 54 megabits of data per second, it only achieves real-world speeds of about 24 megabits of data per second because of network congestion. 802.11n, however, reportedly can achieve speeds as high as 140 megabits per second.

  
    * WiFi radios can transmit on any of three frequency bands. Or, they can "frequency hop" rapidly between the different bands. Frequency hopping helps reduce interference and lets multiple devices use the same wireless connection simultaneously.