The 20-80 rule, also known as the Pareto principle, is a concept that states 20% of efforts or inputs often result in 80% of the outcomes or outputs. This rule is commonly used in business and economics to describe the unequal distribution of resources and outcomes. It suggests that a small portion of the total effort or investment yields a majority of the desired results, while the remaining effort or investment produces minimal results. The 20-80 rule can be applied to various aspects of life, such as time management, productivity, and decision-making, to help individuals and organizations focus on the most impactful actions and achieve maximum efficiency.