The Pareto Principle is also known as the 80/20 Rule-where 80% of the results come from 20% of the functionality. In business it can also be described as 80% of the revenue is generated from 20% of the products/services offered. When it comes to marketing the same holds true-80% of the revenue is generated from 20% of the organic keywords you rank for, content you produce, social media posts you generate etc.