So this will connect to a modem/router and give me wifi?

For the non-tech savvy people like myself....
My MacBook air doesn't have an ethernet port, so I'm assuming this fixes that?
All I want is wifi in my unit, but I'm told I need a laptop with an ethernet connection. This will plug into the router and give wifi?

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    A MacBook Air has a built-in Wifi, you do not require an Ethernet Adapter if you have a Wifi Network in your home/office... etc. However, if you would like to have a wired connection using an ethernet cable, then you need an ethernet adapter to allow this.

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