Wi-Fi is a wireless networking protocol that allows devices to communicate without direct cable connections.

Wi-Fi is the most popular means of communicating data wirelessly, within a fixed location. It’s a trademark of the ​Wi-Fi Alliance, an international association of companies involved with wireless LAN technologies and products.​

To understand Wi-Fi,The main requirement  is that there’s a device that can transmit the wireless signal, like a router, phone, or computer.

The router transmits an internet connection coming from outside the network, like an ISP, and delivers that service to nearby devices that can reach andconvert the wireless signal into datas.

WiFi network makes use of radio waves to transmit information across a network. The computer should include a wireless adapter that will translate the radio signals sent into data. This same signal will be transmitted, via an antenna, to a decoder known as the router. Once decoded, the data will be sent to the Internet through a wired Ethernet connection.

WiFi works on the same principle as other wireless devices – it uses radio frequencies to send signals between devices. The radio frequencies used in walky-talkies, car radios, cell phones are normally in the range of Kilohertz and Megahertz whereas in Wi-Fi they are  Gigahertz. They are either 2.4 GHz or 5GHz in Wi-Fi.

But Microwave uses 2.450Ghz and a faulty one can interfere with WI-Fi. The higher frequency allows the signal to carry more data. The 2.4GHz signal is what all 99% of all global WiFi devices are compatible with. This means that computers, smart TV’s, game consoles, tablets and more are all able to connect to the internet via this frequency

 
The radio signals are transmitted from antennas and routers. These signals are picked up by Wi-Fi receivers, such as computers and cell phones that are Wi-Fi compatible. Antena radiate signals equally well in all directions. These antennas are called omnidirectional (radiation in all directions).
 
The router also has a built-in antenna. Radio waves are emitted from the antenna with a frequency of 2.4Ghz with the speed of light @300,000 km /186,000 miles per second (With this speed, light can circulate around the earth on the equator line, 7 times in one second). This radiowaves are picked by the antenna of the router and again released by the same antenna at the same frequency and normally reachable to 100 feet with the strength of its Mbps. So Antenna releases Radiowaves and these are picked up by antenna of the router. Router releases radiowaves to   Wi-Fi compatible devices. Same is in the reverse process.

Channels 1 6 11 are the best nonoverlapping channels used for wifi

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