If I get wireless internet from Comcast but only want to use it on my laptop will I need a router?

Yes you need a router for any wireless connection.

Then it is a router by default and you don't need any other.

The above post is correct, a router is used to transmit via wifi. Comcast will provide you with a modem (I'd assume) which will have one Ethernet connection that is typically plugged into a router for wireless, but if you just want to use internet with a laptop you can plug the ethernet cable from your modem directly into your pc and not have to use a router.

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