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WiFi adapters are devices that allow computers, laptops, and other devices to connect to a wireless network. They typically plug into a USB port or PCI slot and provide a wireless connection by receiving and transmitting data through radio signals. WiFi adapters come in various forms, including USB dongles, PCI cards, and built-in modules, and support different WiFi standards such as 802.11ac and 802.11ax. These adapters enable devices to access the internet and local network wirelessly, providing flexibility and convenience for users.