Can anyone explain to math-dumb people like me how computers can generate random numbers?

It’s not important to my life, but it does confuse my mind, so I’d kind of like to know.

How do computers make a random number? They must do that all the time, for video games to work, right?

And the fact the computer doesn’t choose the same number each time, or same sequence either…. that seems impossible to me.

So how does that happen? And please explain it simply as possible, using analogies if they work.