Wi-Fi was originally the abbreviation of wireless fidelity. The full English name of Wi-Fi is wireless fidelity. In the field of wireless LAN, it refers to "wireless compatibility certification", which is essentially a commercial certification. , it is also a wireless networking technology. In the past, computers were connected through network cables, but now they are connected to the Internet through radio waves. A common one is a wireless router, so WIFI can be used to connect within the effective range of the radio wave coverage of this wireless router. If the wireless router is connected to an ADSL line or other Internet line, it is also called a "hotspot".

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Wi-Fi is commonly known as wireless broadband (China Telecom also calls CDMA 1X/3G wireless broadband) mobile phones that support Wi-Fi

The so-called Wi-Fi is an industry term issued by an organization called "Wireless Ethernet Compatibility Alliance (WECA)", which is translated into Chinese as "Wireless Compatibility Certification". It is a short-range wireless transmission technology capable of supporting radio signals for Internet access within a range of hundreds of feet. With the development of technology and the emergence of standards such as IEEE 802.11a and IEEE 802.11g, the IEEE 802.11 standard is now collectively referred to as Wi-Fi. From an application level, to use Wi-Fi, users must first have a Wi-Fi compatible client device. Wi-Fi is an Internet technology that helps users access email, the Web, and streaming media. It provides users with wireless broadband Internet access. It's also a fast and convenient way to get online at home, in the office or on the go. A place with access to a Wi-Fi network is called a hotspot. Wi-Fi or 802.11G works in the 2.4Ghz frequency band and supports speeds up to 54Mbps (802.11N works in 2.4Ghz or 5.0Ghz, with a maximum speed of 600Mbps). There are also two protocols in the 802.11 space, including (a) and (b). They are also publicly used, but 802.11G/N is the most commonly used in the world. Bluetooth+wifi wireless devices

Wi-Fi hotspots are created by installing an access point on an Internet connection. This access point transmits wireless signals over a short range - typically 300 feet. When a Wi-Fi-enabled device (such as a Pocket PC) encounters a hotspot, the device can connect to that network wirelessly. Most hotspots are located in places accessible to the general public, such as airports, coffee shops, hotels, bookstores, and campuses. Many homes and offices also have Wi-Fi networks. While some hotspots are free, most stable public Wi-Fi networks are provided by private Internet Service Providers (ISPs), which charge a fee when users connect to the Internet. The full name is Wireless Fidelity. 802.11b is sometimes mistakenly labeled as Wi-Fi. In fact, Wi-Fi is a trademark of the Wireless LAN Alliance (WLANA). This trademark only ensures that products using this trademark can cooperate with each other and has nothing to do with the standard itself. . But later people gradually became accustomed to using WIFI to call the 802.11b protocol. Its biggest advantage is its high transmission speed, which can reach 11Mbps. In addition, its effective distance is also very long, and it is also compatible with various existing 802.11 DSSS devices. Laptop technology - Centrino technology is based on this standard. IEEE ([American] Institute of Electronics and Electrical Engineers) 802.11b wireless network specification is an extension of the IEEE 802.11 network specification. The maximum bandwidth is 11 Mbps. In the case of weak signals or interference, the bandwidth can be adjusted to 5.5Mbps, 2Mbps and 1Mbps, automatic adjustment of bandwidth, effectively ensuring the stability and reliability of the network.

Its main features are: fast speed and high reliability. In open areas, the communication distance can reach 305 meters. In closed areas, the communication distance is 76 meters to 122 meters. It is convenient to support Wi-Fi with existing wired Ethernet networks. notebook

integration, the cost of networking is lower. The official name of Wi-Fi (Wireless Fidelity, wireless compatibility certification) is "IEEE802.11b". Like Bluetooth, it is a short-range wireless technology used in offices and homes. Although this technology is worse than Bluetooth technology in terms of data security, it is slightly better in terms of radio wave coverage. The Wi-Fi coverage range can reach about 300 feet (about 90 meters), not only in offices, but also in smaller entire buildings.