then you don't have to run a wire to your computer your computer will get the signal its kinda point less to get one unless you have a laptop or your wires are running everywhere around your house which i doubt they are
Some devices like Pda's and the nintendo ds can only be connected through a wireless connection.
another reason you might use one would be if you have 1 computer connected to the internet and you wanted a second computer connected to the internet without having to run cable's all through out the house you could just do it wirelessly.
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It's allso very usefull if you want to chat on the internet while your taking a hot steamy dump, like i am right now.
A wireless router, basically allows you to have more than 1 computer on the internet all through the same Cable Modem wirelessly. In order for this to work, you will need a wireless router that connects from the cable modem and second you will need a wireless adapter on the computer which will be accessing the wireless router.
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