The C++20 STL Cookbook provides recipes to help you get the most out of the C++ STL (Standard Template Library), including new features introduced with C++20.
C++ is a rich and powerful language. Built upon C, with syntactic extensions for type safety, generic programming, and object-oriented programming, C++ is essentially a low-level language. The STL provides a broad set of higher-level classes, functions, and algorithms to make your programming job easier, more effective, and less prone to error.
I've often said that C++ is five languages cobbled into one. The formal specification includes 1) the entire C language, 2) C's cryptic-yet-powerful macro preprocessor, 3) a feature-rich class/object model, 4) a generic programming model called templates, and finally, built upon C++ classes and templates, 5) the STL.