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A USB WiFi adapter overrides the computer's built-in wireless functionality, giving you a faster, more reliable connection to your available network signals through the USB port instead. Since most computers have at least one USB port, you'll typically be able to use it on both laptops and desktops.

The motherboards only usually have a slot for wired connection. You need to buy a wifi card or a USB wifi dongle device, unless otherwise stated, most motherboards do not have wifi. one should buy an adapter, preferably one that's PCI-E.

A wireless network allows devices to stay connected to the network but roam untethered to any wires. A wired network uses cables to connect devices, such as laptop or desktop computers, to the Internet or another network. A wired network has some disadvantages when compared to a wireless network.

Yes, We can connect once and forget.

Yes, you can connect 4 devices at the same time.

Yeah, you can attach them, but they don't actually do anything. Kind of a bummer, too, since using that on-screen keyboard of theirs is kind of a pain -- we often aim off our letter when pressing the A button to type.