Resisting impulse in trading refers to the ability to control one’s emotions and make logical, well-thought-out decisions when buying and selling securities. It is important for traders to resist the impulse to make impulsive trades based on fear or greed, and instead to stick to a well-developed trading plan that takes into account factors such as market conditions and risk management. This can help traders to avoid making costly mistakes and increase the chances of achieving long-term success in the markets.