WI-FI（Wireless Fidelity），是一种可以将个人电脑、手持设备（如PDA、手机）等终端以无线方式互相连接的技术。Wi-Fi是一个无线网路通信技术的品牌，由Wi-Fi联盟（Wi-Fi Alliance）所持有，目的是改善基于IEEE 802.11标准的无线网路产品之间的互通性。现时一般人会把Wi-Fi及IEEE 802.11混为一谈。甚至把Wi-Fi等同于无线网际网路。Wi-Fi的样式有很多类型，有无线的卡，还有连接电脑的等等。(WI-FI (Wireless Fidelity), is a can be personal computers, handheld devices (such as PDA, mobile phones) and other terminals connected to each other wireless technology. Wi-Fi is a wireless network communications technology brand, held by the Wi-Fi Alliance (Wi-Fi Alliance), the purpose is to improve the IEEE 802.11-based wireless network products between the interoperability. At present, most people will talk about Wi-Fi and IEEE 802.11. Even Wi-Fi is equivalent to wireless Internet. Wi-Fi style has many types, there are wireless cards, there are connected to the computer and so on.)