Difference between NULL and Undefined in JavaScript

Both null and undefined represent the absence of a value in JavaScript, but they are different in purpose and use.

1. Null

• Null is an intentional absence of value, representing "nothing" or "empty."
• It is explicitly assigned to a variable to indicate that it has no value.

Example:

let value = null;
console.log(value); 
    

Output: null

2. Undefined

• Undefined means a variable has been declared but not yet assigned a value.
• It is the default value for uninitialized variables.

Example:

let value;
console.log(value);
    

Output: undefined