The "C++ Standard" refers to a set of specifications that define the C++ programming language, ensuring consistency and portability across different platforms and compilers. It outlines the syntax, semantics, and libraries available in C++, allowing developers to write code that behaves the same way regardless of where it is compiled or executed. The standard is maintained by the International Organization for Standardization (ISO) and has undergone several revisions since its initial release in 1998. Key versions include C++98, C++03, C++11, C++14, C++17, and C++20, each introducing new features and improvements to enhance the language's functionality and usability.