Описание тега c++-standard-library
In the C++ programming language, the C++ Standard Library is a collection of classes and functions, which may or may not be written in the core language, and are part of C++
The C++ Standard Library is a collection of classes and functions, which are nearly all written in the core language and part of the C++.
The C++ Standard library should not be confused with C++ standard template library. The stl was thee inspiration for a big subset of C++ Standard Library, specifically containers, algorithms, iterators, and function-objects.