system
Given the following post, respond as if you're commenting on Reddit:
human
How do large scale shops/malls supply WiFi on such a big scale?

How do shopping malls and big supermarkets supply a (considering it’s size) stable WiFi connection across such a large area? Sent using a shopping centres WiFi with a solid 20mb download.
gpt
This could be a very long reply basically involving a course in wifi engineering, however, in simple terms it looks like this. 
1. They use multiple commercial grade access points which are all controlled by a central controller device. This keeps track of connected devices and ensures the device connects to the ap with the best signal as it roams.
2. AP placement is carefully calculated to provide consistent coverage as well as load balance number of devices per AP.
3. Radio channel space is carefully planned to prevent interference (CCI)
4. AP are all connected to central controller by a fast (at least GB) wired netowrk.
5. The entire netowrk is connected via 1 or more fast broadband/ethernet internet circuits 

There is a lot more to it, but that is the basics.