Like you are five? Ok....
You ask your mum if you can have some sweets later. She can either resolve sweets ( yes you can have some), or reject your request (no sweets for you. You’ve been naughty).
When it gets to later, if her promise resolved (ie she said you can have some) THEN you can eat them. Otherwise, you have to CATCH the tears you cry because you can’t eat sweets. Simple, huh?
A promise contains a resolve and reject. When it is actually called (the function is invoked), if it resolves, use THEN, or CATCH the rejection.
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