What is data type in c plus plus?

A data type simply means the type of data represented by a variable or constant, or the return type of a function. C++ is a strongly-typed language thus all variables and constants must have a data type associated with them. The data type may be a primitive data type such as int or char, which are used as the building blocks for more complex data types. Primitives, typedefs, enums and classes (which includes structs and unions), are used to provide the definitions for all the various data types that you can employ within a program. Variables and constants provide instances of those data types. Pointer variables must also have a data type associated with them to determine the type of data being referred to, even if it is void* which simply means it points to any data type, the actual data type being determined at runtime. However, in C++, void* is rarely required since polymorphism allows programmers to treat objects generically; there is rarely a need to know the actual runtime type of an object, since that information is provided automatically by the object's own virtual table. The programmer need only know the generic data type and call the appropriate virtual methods of that type in order to invoke the specific behaviour of the actual data type.