where do the values in a for...of loop come from code example

Example 1: for of loop javascript

const array1 = ['a', 'b', 'c'];

for (const element of array1) {
  console.log(element);
}

// expected output: "a"
// expected output: "b"
// expected output: "c"

Example 2: for of loop in es6

let colors = ['Red', 'Blue', 'Green'];
for (let color of colors){
	console.log(color);
}