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A WiFi adapter is a very important part of a computer system--especially on a laptop. It is the part of a computer that connects to wireless internet. A WiFi adapter connects your computer wirelessly to a LAN (local area network) that may or may not be connected to the internet. To wirelessly connect your computer directly (so to speak) to the internet you need a wireless broadband adapter from a cellular carrier. Adapters can be PCMCIA, Express Card, USB or can use your WiFi to connect to a MiFi adapter which connects to your cellular carrier.
A WiFi USB adapter is a device inserted into a computer's USB port that allows a computer to be connected to wireless internet or WiFi without a cord connecting the computer to Internet access (a router of some sort). Newer laptops don't normally require this device, as a majority have wireless radios factory installed. A WiFi USB adapter is generally used on older laptops and desktops that don't have a connection near the computer.
A WiFi USB adapter is a device inserted into a computer's USB port that allows a computer to be connected to wireless internet or WiFi without a cord connecting the computer to Internet access (a router of some sort). Newer laptops don't normally require this device, as a majority have wireless radios factory installed. A WiFi USB adapter is generally used on older laptops and desktops that don't have a connection near the computer.