"Garbage collection is simulating a computer with an infinite amount of memory". https://blogs.msdn.microsoft.com/oldnewthing/20100809-00/?p=...

We both agree, I'm just using this as a pretext to share this intriguing piece of knowledge. I find the concept much more intuitive than "getting back unused memory".

Especially when you look at the 90% memory usage on your OS, it still make sense with the "infinite memory simulation" definition.