Questions about instruction specific to the programming language C++. Use this tag only when the language used would affect the question significantly (if your question uses C++ as an example, but does not focus on the language itself, you need not use the tag).
C++ is a programming language created as an extended version of C. It can be object oriented and generic and can also work with low-level memory.
C++ has been used in CS education for many reasons. While still relatively low-level (e.g. pointers and other C concepts), it can also be used to teach OOP.
More information can be found in the C++ Wikipedia page, and on the C++ website.