C++ language is accompanied by a library called the C++ Standard Library. It is a collection of containers and useful functions that we access by including the proper header file. The containers and functions inside the C++ standard library are defined in the std namespace. Remember the std::string type mentioned earlier? It is also a part of the standard library. The standard library is implemented through class templates. Long story short: prefer using the standard-library to user-provided libraries for everyday tasks.
Some functionalities explained in this ...