Picture that your computer is just an internet browser.
A regular computer is just like a browser with only one tab.
If you have a browser with multiple tabs, picture that each tab is a VM. Every tab is running on the same hardware, but when you are using each tab they operate essentially the same as the stand alone computer.
So in your example, you can go to one tab and type an essay. Open another tab and type an email. When you click back to your first tab your essay is still there. Your essay doesn’t know that your email exists, nor does your email know that your essay exists, even though both are running on the same computer.
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