What is the difference between a parameter and an argument?

TL;DR

A parameter is a variable in the declaration of a function, while an argument is the actual value passed to the function when it is called. For example, in the function function add(a, b) { return a + b; }, a and b are parameters. When you call add(2, 3), 2 and 3 are arguments.

Difference between a parameter and an argument

Parameters

Parameters are variables listed as part of a function's definition. They act as placeholders for the values that will be passed to the function when it is called.

Example:

function greet(name) {
  console.log('Hello, ' + name);
}

In this example, name is a parameter.

Arguments

Arguments are the actual values that are passed to the function when it is invoked. These values are assigned to the corresponding parameters in the function definition.

Example:

greet('Alice');

In this example, "Alice" is an argument.

Key differences

Parameters are part of the function's signature, while arguments are the actual values supplied to the function.
Parameters are used to define the function, whereas arguments are used to call the function.

Example combining both

function add(a, b) {
  // a and b are parameters
  return a + b;
}

const result = add(2, 3); // 2 and 3 are arguments
console.log(result); // Outputs: 5