Wi-Fi is a technology that allows electronic devices to connect to a wireless local area network (WLAN), usually using 2.4G UHF or 5G SHF ISM radio frequency band. Connecting to a wireless LAN is usually password protected; But it can also be open, which allows any device within the range of WLAN to connect. Wi-Fi is a brand of wireless network communication technology, which is owned by the Wi-Fi Alliance. The purpose is to improve the interoperability between wireless network products based on IEEE 802. 1 1 standard. Some people call the local area network using IEEE 802. 1 1 series protocols as wireless fidelity. Even equate Wi-Fi with wireless Internet (Wi-Fi is an important part of WLAN).
Regarding the pronunciation of the abbreviation "Wi-Fi", according to the pronunciation notes of the English standard Webster dictionary, the standard pronunciation is/? wa? .fa? /Because the word Wi-Fi is composed of two words, it is best to write in WI-FI, so there is no so-called pronunciation problem as experts say. Similarly, there is HI-FI(/ha? .fa? /）。
Wireless Internet access can be simply understood as wireless Internet access. Almost all smart phones, tablets and laptops support Wi-Fi Internet access, which is the most widely used wireless network transmission technology today. In fact, it is to convert wired network signals into wireless signals, as introduced at the beginning, using wireless routers for receiving related computers, mobile phones, tablets and so on that support its technology. If the mobile phone has the Wi-Fi function, when there is a Wi-Fi wireless signal, it can surf the Internet without using the mobile Unicom network, saving the traffic fee.
Wireless Internet access is commonly used in big cities. Although the wireless communication quality transmitted by Wi-Fi technology is not very good, the data security performance is worse than that of Bluetooth, and the transmission quality needs to be improved, the transmission speed is very fast, reaching 54Mbps, which meets the needs of personal and social informatization. The main advantage of Wi-Fi is that it doesn't need wiring, and it is not limited by wiring conditions, so it is very suitable for the needs of mobile office users. And because the transmitted signal power is lower than 100mw, it is lower than the transmitted power of mobile phones, so Wi-Fi surfing the Internet is relatively the safest and healthiest.