The Halloween Strategy, also referred to as the "Sell in May and Go Away" strategy, involves selling stocks before May 1st and waiting until October 31st to reinvest. This approach is based on historical data that shows the stock market tends to underperform during the summer months. By implementing this strategy, investors aim to increase their profits and minimize their risk. However, it is not a foolproof method and should be carefully considered before making any investment decisions.