Next to drawing a single tarot card for a quick answer to a simple question, the 3 Card Tarot Reading is probably the second quickest and simplest form of a tarot spread. With the three cards, one representing each, the past, the present and the future, you are better able to get a centered reading.
The past is just that, the past. The card represents what has been taking place in your life up to this point. It may indicate something that is about to pass or at least behind you.