Whats the difference between a Wired router and a Wireless router?

well i know im getting one..and i just wanna know whats the difference and which one is better. and which one is easier to use.
Update: and which one would you recommend me getting?
Update 2: and i know theres a difference that one of them is wired and the other one isnt..........i know thati just wanna know addition comparisons.......
Update 3: just so you know my computer is upstairs and my wii is downstairs
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