What does every variable in C++ have?

In C++, every variable is defined by two main attributes: a type and a value. The type of a variable specifies what kind of data it can hold, such as integers, floating-point numbers, characters, or user-defined types. This is crucial because the type determines how the variable will be stored in memory and how the compiler handles it during operations.

The value of a variable is the actual data it holds at any given moment. For instance, if you declare an integer variable and assign it the value 5, the variable has the type 'int' and its value is currently 5. This understanding of type and value is fundamental in programming since it influences how operations are performed on variables and how memory management is handled.

This concept is essential for writing effective C++ programs, as it affects both the correctness and performance of the code. The other options do not accurately represent the essential characteristics of a variable in C++.