system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does my wifi signal go from full to nothing and back even when I'm not moving?

Campus wifi, specifically. I know that signal strength varies, but why? Even when sitting in a dorm room, not moving about, why does it vary? 

I've looked up technical explanations, but they're a bit over my head.
gpt
Noise due to other wireless devices. Your signal strength is actually a measure of your signal to noise ratio. If extra noise is added, your signal strength decreases. That noise is coming from other devices in your vicinity. 

Additionally, in a complex wifi network like a university campus, there are multiple access points. You might have been handed off to another one due to higher signal strength or for load balancing.