RAM is like your phone’s short term memory. It actively uses it to store data that it currently works with, but like your brain, there’s only so much it can store simultaneously.
Virtual memory is similar to when you write things down while working so you don’t forget them. It’s much slower to look things up that you wrote down than it is to quickly remember them, but forgetting would be really bad for the apps you’re using.
When your phone thinks that its RAM won’t be enough it will write some stuff out to your internal storage (same place that stores pictures, apps and files) temporary, stuff that it thinks it won’t need anytime soon.
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