Difference between let and VAR in JS

The let statement declares a block scope local variable, optionally initializing it to a value.

Description: let allows you to declare variables that are limited in scope to the block, statement, or expression on which it is used. This is unlike the var keyword, which defines a variable globally, or locally to an entire function regardless of block scope.

An explanation of why the name "let" was chosen can be found here.

Scoping rules:

Variables declared by let have their scope in the block for which they are defined, as well as in any contained sub-blocks.

The main difference is that the scope of a var variable is the entire enclosing function.

see full details about let with examples.