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Wi-Fi is a way of connecting to a computer network using radio waves instead of wires. It was invented to connect computers that are near each other, and nowadays is much used for Internet connections.

The Wi-Fi Alliance says Wi-Fi is any "wireless local area network" (WLAN) that follows the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 specification. A Wi-Fi device can work with any Wi-Fi network anywhere in the world.