It is a reversal technique that is depicted by three highs and two dips.The center high which is the peak is the head and the two subordinate highs to the left and right of the head are the shoulders.A break out through the head and shoulder curves indicate a good sell opportunity whereas a break out of an inverted head and shoulder curve indicates good buy opportunity.It takes around 2-3 months to get a proper head and shoulder curve and once that happens its a good time to short sell.