Momentum trading is a style of trading that is focused on trading stocks that have a high probability of making a big percentage move in a short period of time. The style of trading is ideal for day traders, as it offers the potential to make huge returns in just hours or days. It is a style of investing that is based on taking short-term positions in stocks going up and selling them as soon as they show signs of the trend ending. It is a great strategy to short sell stocks, meaning betting on a stock to go down.