What is a variable in programming?

In programming, a variable is defined as a user-defined name that represents a data value. This means that a variable acts as a symbolic placeholder for data, allowing programmers to store information that can be modified and accessed throughout their code. By assigning a name to a data value, it becomes easier to reference that value without needing to remember the actual data itself. For example, if a variable is named 'age' and assigned the value 25, you can use 'age' in calculations or outputs without referring to the number directly.

This concept allows for flexible coding practices, enabling the manipulation of the stored value as the program runs. Using meaningful variable names enhances code readability and maintainability, making it simpler for developers to understand the purpose of different pieces of data in their applications. Variables are fundamental to all programming, as they allow developers to create dynamic and responsive software.