Internet connection sharing :
With the network different computers in the same home or office can use high speed internet connection at the same time. For example if you have one internet connection and three computers can access to the internet at the same time.

File-sharing :
is the sharing of computer data or space on a network. File-sharing allows multiple users to access the same file from different computers at the same time, giving the user the ability to read, modify, copy and/or print it. This saves time from using flash drives to transfer data.

Printer sharing :
allows one main printer to handle all the print jobs for all the other computers that are connected to that printer. This allows for more than one person to use a single printer. This method is most commonly seen in large libraries, such as those found on college campuses, and in business offices.. This saves money and time. A wireless connection is the fastest way to print. A home network can be set up so that all the printers in the house can connect to the printer from where ever they are without using any cables.

a multi-user game
gamers acquire the game and interact with other players on a central server via the network, So that every person sitting at the computer and participate in the game


why do we use WIFI?

If you decide you need a network, the following decision is to identify the network type to be used:
 a traditional wired network (Ethernet) or wireless network (WIFI).WiFi is steadily increasing.

Advantages of wireless networks :
Ease of transport: such as mobile phone, allowing you or your laptop computer pocket that relate to the network from anywhere, and will not be obliged to sit on the desk in front of the computer desktop. With the use of wireless networks, you can check on the price of the stock market while you are sitting and relaxing in front of the television, and check your e-mail while you are in the kitchen, or sitting in a quiet place at home in order to complete important work. In addition, you can carry the wireless computer outside the home and connected to the Internet through "WiFi" that installed everywhere now, such as airports, hotels and universities, restaurants, cafes, and other

Easy installation: wireless networks do not need to pass a large amount of wiring between the computers ( that process requires long hours of the passage of cables through walls and along the walls)

Breadth of coverage area:
a wireless network signal could covering a wide area. For example, if you put your computer in the garage or in a room on the roof of the house, you can connect to the wireless network and therefore related to the other PCs inside the home and share files, printers, and Internet connection with them.

Disadvantages of wireless networks

Interference: wireless networks use radio waves to transfer data between computers, so the radio waves from microwave ovens and mobile phones can be confusion on the Wireless networks.

Security attacks:
thieves can be seated in their cars outside of your home or office and thievery signals from the wireless network and exploitation if the network were not secured properly. In fact, there are thieves able to extract credit card numbers of wireless networks while they are sitting in the parking. Despite that, applying the application of security standards - which are available in all wireless devices - must ensure that the safety of the network and exchanging information.

Control the network settings is more complex:
in some cases, the control of the security settings and other settings for the wave is difficult For your information Wireless networks use radio waves it is possible it may concern your health .
Luckily researches proved that energy comes out of wireless network is less than that comes out mobiles , there are no official reports refers that wireless networks cause harm to health in spite of this perceptional action do not touch the wire or wireless card during use

How wireless nets works ?
If you are about to buy wireless net it is useful to understand the general picture about the nature of its work . if you do not want to go into technical details
Then your understanding of general basics of the net will give you good feeling which may help you at time of difficulties . Here are some of these general principals .

Wireless network card :
Every computer on the net should have wireless card adjusted properly to enable him receive and send wireless signals .

Wireless wave:
the main instrument in wireless net connected with modem to provide fast dialing of all instruments connected with the internet it also sends radio waves allows computer instruments contact the net

data transfer system :
wireless net cards rotate in receiving and sending data through radio waves . before one card start sending data it analysis air so that she knows if another card is sending data or not , if the other card is sending data the first one waits till ends . the style of “ silent before you send “ guarantee that data is sent through air and give the other card the chance to send its data any time .

For your information:
If you want to buy equipment good for work with any of these measurements (a,b,g) then buy a wave and net cards double wave

Be sure of equipments conformity:
Because there are many and different measurements for wireless nets we should be sure that net cards bought are in conformity with wireless waves, other wise instruments will not be able to talk to each other. In addition if you are planning to benefit from certain specifications like saving energy you should be sure that these specifications prepared in

proper way Long lasting of your wireless equipment:
Wireless net equipment developed quickly and became faster and safer these equipments should last for years before a new generation is coming out . here are some glimpses to keep these equipments durable .

Buy products authorized by wifi union:
This is important points we should concentrate on. if these products are not wifi you will go into a risk of causing many problems in the future
 
Updates internal programs and operation programs:
From time to another the producing companies produce new programs to update the old ones of firm ware and the drivers by this they tackle the exciting problems and solve security system which maybe discovered it is good idea to make updating every few months some companies send advertisements by email to inform clients . Others do not so you have to visit website every now and then.

How many computers supported by the nets:
The medium wireless wave can support 20 computer units even though to use the specifications of Vonage would weaken the net and stop it if this happens you can use two waves in the same net but control each on different channel .