clarify the concept of library and types of libraries

Question

what is a library in non-technical terms?

what is the iostream library?

what is the string library?

Answer 1

a library is a file with lots of functions that can be used. there are standard librarys that are free and suported by most of the OS( like iostream.h and string.h) and there are other librarys like conio.h that are supported by a private company or someone.
librarys are make to save time because someone do the job once and then the others use it without having to make the functions again
iostream is part of the standard library and is make to handle inputs and outputs, string is part of the standard library too and it handle string related functions

Answer 2

Thank you very much. I'm understanding better.