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What is the main difference between var and let keywords in JavaScript?

21. What is the main difference between var and let keywords in JavaScript?

1. var defines a variable while let defines a constant
2. var defined function scoped variable while let define block scoped variable
3. The value of a variable declared with var can be changed while the value of a variable declared with let cannot be changed
4. All of the above

Answer: B) var defined function scoped variable while let define block scoped variable

Explanation:

The var and let keywords are both used for variable declaration in JavaScript. But, the main difference between them is that var defines function scoped variable while let defines block-scoped variable.