Wi-Fi
Wi-Fi
Wi-Fi is a wireless networking technology that uses radio waves to provide high-speed Internet and network connections. The term is a brand name owned by the Wi-Fi Alliance and is derived from "Wireless Fidelity," although it is not an abbreviation. Wi-Fi is based on the IEEE 802.11 family of standards and is widely used for local area networking of devices such as smartphones, laptops, tablets, and smart home appliances.
History
The development of Wi-Fi began in the late 1980s with the creation of the IEEE 802.11 standard, which was officially released in 1997. The first generation supported data rates up to 2 Mbit/s. In 1999, the Wi-Fi Alliance was formed to certify interoperability among products. Subsequent standards, such as 802.11b (1999), 802.11g (2003), and 802.11n (2009), improved speed and range. The 802.11ac standard, introduced in 2013, brought operation in the 5 GHz band with speeds exceeding 1 Gbit/s. In 2019, the Wi-Fi 6 designation was launched under 802.11ax, focusing on efficiency in dense environments. The latest generation, Wi-Fi 7 (802.11be), began rolling out in 2024.
Features
- Wireless connectivity: Allows devices to connect without physical cables, using radio frequency bands (typically 2.4 GHz, 5 GHz, and 6 GHz).
- Security protocols: Successive standards include WEP, WPA, WPA2, and WPA3, providing encryption and authentication.
- Roaming: Enables devices to move between access points while maintaining a connection, essential for wireless LANs.
- Mesh networking: Modern Wi-Fi systems can form mesh networks, extending coverage using multiple nodes.
- Backward compatibility: Newer standards support older devices, though at reduced speeds.
Common uses
Wi-Fi is ubiquitous in homes, offices, public spaces, and hospitality venues. It is used for internet access, file sharing, printing, streaming media, voice over IP (VoIP), and controlling Internet of Things devices. Public hotspots are often provided by coffee shops, airports, and libraries.