The term "key players" refers to individuals or groups who play a significant and influential role in an event, situation, or organization. These are people whose actions, decisions, or opinions have a substantial impact on the outcome or progression of something. They may be leaders, decision-makers, or those with specialized knowledge or skills that are crucial to the success of the endeavor they are involved in. In short, key players are essential components who contribute greatly to the overall result and cannot be easily replaced.