The function std::copy is part of the C++ Standard Library and is used to copy elements from one range to another. It takes three parameters: the beginning and end of the source range, and the beginning of the destination range. This function is useful for duplicating data in containers like arrays or vectors. std::copy works with iterators, which are objects that point to elements in a container. It can handle various types of data, including built-in types and user-defined objects, making it a versatile tool for managing collections in C++. Proper use of std::copy ensures efficient data handling and minimizes errors in copying operations.