What is function ? How to Make Function ? Example code

In coding, a function is a reusable block of code that performs a specific task or set of tasks. Functions are used to organize code into manageable and modular pieces, making it easier to understand, maintain, and debug. Functions help promote code reusability and abstraction, allowing developers to write code once and use it multiple times throughout a program.
A function typically has a name, a set of parameters (optional), a return type (optional), and a body containing the code that defines the functionality. When a function is called or invoked, the program executes the code within the function's body.