Conversation so far:
in a programming language what is a standard library
In the C++ programming language, the C++ Standard Library is a collection of classes and functions, which are written in the core language.
What is C++?
C++ is a high-level, general-purpose programming language created by Bjarne Stroustrup as an extension of the C programming language, or C with Classes.

Question: can you define the last word in the answer in regards to programming
Self-contained rewrite: What are classes in regards to programming languages?