We are writing an algorithm and we need to make sure we are doing each step correctly.
Lets just assume that a step adds two number.
// We add the first number to the second number
// So if the first number is 1 and the second number
// is 2 the sum is 3.
//==============================================let sum = a + b
This example is simple. I find that for more advanced logic this is very helpful. I also find that my variable names become better and more meaningful.