The Ordinary Form of the Mass is the current edition of the Missal (the Third Edition of the Missal of Pope Paul VI) that you will see celebrated in the vast majority of Catholic parishes every day throughout the world.
The Extraordinary Form of the Mass (sometimes referred to as the “Tridentine Latin Mass” or “Traditional Latin Mass” or even just the “Latin Mass”) uses the 1962 Missal promulgated by Pope John XXIII.