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what exactly does a usb network adapter do?

im really curious as to what the point of the network adapter is. i understand its meant to find local wireless networks, but aren’t all laptops built in with one already? my laptop has no problem finding a network. does the usb give a stronger signal or something?

Some USB adapters can give you access to Networks that are farther away depending on their strength. Some also upgrade the speed ex. 802.11g to 802.11n.

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