What is a Function?

01 How It Works

Think of a vending machine: you insert inputs, internal machinery runs, and an item is returned.

Functions encapsulate logic so you can write code once and execute it multiple times with different inputs.

function greet() {
  console.log("Hello, World!");
}
greet();

1. 1. Define the routine using the function keyword.

2. 2. Group statements inside curly braces.

3. 3. Execute the function using parentheses.

02 Practical Example

Here is how you might see this concept applied in real-world code:

function printWelcome() {
  console.log("Welcome to the application!");
}
printWelcome();

Related Concepts

• Function Declaration
• Function Expression