The C++ STL (Standard Template Library) is a powerful set of C++ template classes to provide general-purpose classes and functions with templates that implement many popular and commonly used algorithms and data structures like vectors, lists, queues, stacks and maps.

While programming many a time there is a need for creating functions that perform the same operations but work with different data types. So to overcome this problem C++ provides a feature to create a single generic function instead of many functions which can work with different data type by using the template parameter. The collection of these genric classes and functions is called Standard Template Library(STL)

The Standard Template Library (STL) in C++ makes the code run faster and more efficiently.