I have a few things i didnt quite understand

I have some questions, would love to get some explanation
-What actually is string, i didn’t understand if it is a class or a type or an array or anything else
-What is a class (i think i got the general point of it being a box full of useful code, like sort of an engine)
-What comes before and what comes after, is it header file-> class-> using-> type, what’s the order of it, what contains what
im sorry for my bad english.
Thank you
P.S. I got to section 2 lesson 29 video

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