What is Wifi Wireless?

WiFi is a wireless networking technology used across the entire planet. WiFi refers to any technology that uses the 802.11 standard, which was created by IEEE and released in 1997. The word WiFi was first published by the WiFi Alliance, a group that started the commercialization of the system. WiFi has many advantages. Wireless networks are easy to set up and cheap. Unless you're looking for a place to make use of your laptop, you may not even notice when you're in a hot-spot. The radios used for WiFi are very alike to the radios used for cell phones and other similar elements. They are able to transmit and receive radio waves, and they can change 1s and 0s into radio waves and convert them back into ones and zeros. But WiFi devices have a few differences from other radio devices:

 They can transmit at frequencies of 2.4 GHz or 5 GHz. This frequency is significantly higher than the ones used for cell phones and other devices. A higher frequency allows the signal to transport more data.  They use 802.11 standards, which come in a number of systems:

• 802.11a transmits at 5 GHz and can move up to 54 MB. It also uses a more resourceful coding system that divides that radio signal into numerous signals before they get to a receiver, called OFDM. This reduces interference.
• 802.11b is the slowest and least expensive standard. For some years, its cost made it well-liked, but now it's becoming less common as faster systems become cheaper. 802.11b transmits in the 2.4 GHz frequency band of the radio spectrum. It works up to 11 megabits and it CCK modulation to get better speeds.
• 802.11g transmits at 2.4 GHz, but it's much faster, and it can handle up to 54 MB of data per second.
•  802.11n is the most recent standard that is broadly available. This standard notably improves speed. For instance, although 802.11g in theory moves 54 MB, it only reaches real speeds of about 24 MB of data per second because of congestion. However, 802.11n can achieve speeds as high as 140 MB per second.
•  Different 802.11 standards centre on particular applications of WiFi networks, like wide area networks in vehicles or systems that let you move from one WiFi network to another flawlessly.

If you want to take the most of public WiFi hotspots or begin a wireless network at home, what you have to do first is make sure your PC has the correct equipment. Most laptop computers and desktop computers – the new ones - come with built-in wireless devices. If your laptop doesn't have one, you can purchase a special adapter that plugs into the computer card slot (or the USB port). Many of these wireless adapters can use more than one WiFi standard.

Once you've set up your wireless adapter and the necessary drivers that allow it to start working, your PC should be able to discover present networks. This means that when you turn on your computer in a wireless hotspot, the laptop or desktop computer will notify you that the network is there and ask if you want to connect to it. If you have an old computer, you may need to use a specific program to connect to a WiFi network.

Wireless makes use of a system known as “frequency hopping”, which uses a lot of frequencies in different ranges, and continuously change between them. This makes WiFi pci-network-cards more resistant to interference from other signals than they would be only transmitting one frequency.

One of the most important parts comes to all the laptop or desktop computers on a network sharing an Internet connection. This is achieved using a wireless device called an Access Point (AP). These types of network elements are more expensive than WiFi cards for one PC or laptop, as they include radios that are able of connect to around 100 computers at the same time, and sharing Internet access between all of them. Other devices like dedicated Access Points are only really necessary for larger networks, but if you only have a small amount of computers, it is possible to utilize one of them as the AP.

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