For loop in js

Question

Can someone explain why are these two different

for (var i = 1; i < 5; i++){
setTimeout(() => { console.log(i); }, 1000);
}

for (let i = 1; i < 5; i++){
setTimeout(() => { console.log(i); }, 1000);
}

Answer 1

Unlike the var keyword, which defines a variable globally, or locally to an entire function regardless of block scope, let allows you to declare variables that are limited in scope to the block, statement, or expression in which they are used.

Answer 2

https://www.sololearn.com/Discuss/1777661/?ref=app