In programming, a function is a self-contained, reusable block of code designed to perform a specific task or set of tasks. Functions provide a way to organize code into modular and manageable units, promoting code reusability and readability. Here are key components of a function:

• Function Declaration:
  Specifies the function's name, return type, and parameters (if any).
• Function Definition:
  Contains the actual implementation of the function, defining what the function does.
• Return Type:
  Indicates the type of data that the function will return (if any).
• Function Name:
  Identifier used to call the function.
• Parameters:
  Variables that the function accepts as input.
• Function Body:
  Contains the statements that define the logic of the function.
• Return Statement:
  Specifies the value that the function sends back to the calling code.