Function Definition
A function definition is a fundamental programming concept that specifies a reusable block of code designed to perform a specific task, typically by taking inputs (parameters), executing statements, and optionally returning a value. It encapsulates logic to promote modularity, reduce redundancy, and improve code maintainability across various programming languages. Functions are defined with a name, parameters, and a body, and are invoked (called) to execute their code.
Developers should learn function definitions to write efficient, organized, and scalable code, as they enable code reuse, simplify debugging, and enhance readability by breaking complex problems into smaller, manageable parts. They are essential in scenarios like data processing, algorithm implementation, and building modular software components, and are used in virtually all programming tasks from simple scripts to large-scale applications.