Find out the differences between WLAN (Wireless LAN) and a WLAN (Wireless Fidelity) and why the difference between the network protocols is so important!
Although many "Wireless LAN" use WLAN and "WiFi" interchangeably, there is a difference between WLAN and WiFi and here it is fundamental: WiFi is a specific type of transmission (subtype) of WLAN.
I created a simple picture to illustrate how these two types of wireless communication behave!
The term Wi-Fi was created by an organization called the Wi-Fi Alliance that oversees tests that certify the interoperability of products. A product that passes Allianz's tests is awarded the “Wi-Fi Certified” label (a registered trademark). Such as the standard, the 802.11n, 802.11g, 802.11ac, etc.
There are also different WLAN technologies that you can only become familiar with as an engineer. You will certainly find a few more resources on the Internet. The WLAN and WI-FI Technic is very common, not only under Linux, Apple's MAC, Google's Android and Samsung smartphones, but also under --- OS_Windows6.1S ---!
So don't get confused by Wi-Fi, WiFi and WLAN and LAN!