what does the i mean in looping in javascript code example

Example 1: javascript for loop 5 times

for (let step = 0; step < 5; step++) {
  // Runs 5 times, with values of step 0 through 4.
  console.log('Walking east one step');
}

Example 2: looping in javascript

for (initialization; test condition; iteration statement) {
   Statement(s) to be executed if test condition is true
}