noun
Wi-Fi; wireless LAN
Standard term for wireless local area network technology; used in both technical and everyday contexts.
See also: 無線ＬＡＮ
カフェで無料のＷｉ-Ｆｉが使えます。
You can use free Wi-Fi at the café.
Ｗｉ-Ｆｉのパスワードを教えてください。
Please tell me the Wi-Fi password.
More technical term for wireless LAN; Ｗｉ-Ｆｉ is the common consumer-facing word.
Borrowed from English 'Wi-Fi', a trademark of the Wi-Fi Alliance.