For this video why was a for loop used , instead of a "for in" loop?

function print(message){
  var outputDiv = document.getElementById('output');
  outputDiv.innerHTML = message;
}

var HTML = '';

var students = [
  {
   Name: 'Jerry',
   Track: 'Front End Development',
   Achievements: 10,
   Points: 1216
  },
  {
   Name: 'Angelica',
   Track: 'iOS',
   Achievements: 8,
   Points: 1000
  },
  {
   Name: 'Robert',
   Track: 'Full Stack Developer',
   Achievements: 47,
   Points: 17000
  },
  {
   Name: 'Jordan',
   Track: 'Front End Developer',
   Achievements: 7,
   Points: 900
  },
  {
   Name: 'Kai',
   Track: 'Full Stack Developer',
   Achievements: 36,
   Points: 14000
  }
];

for (var i = 0; i < students.length; i++){
  HTML += '<br>'
  HTML += '<b>Student: ' + students[i].Name + '</b><br>';
  HTML += 'Track: ' + students[i].Track + '<br>';
  HTML += 'Achievements: ' + students[i].Achievements + '<br>';
  HTML += 'Points: ' + students[i].Points + '<br>';
}

print(HTML);