Humic matter or humus is a vital component of soil that promotes plant growth and fertility. It is the organic matter that originates from the decomposition of dead plants, animals, and other microorganisms. While the term humus is commonly used, other synonyms like organic matter, soil organic carbon, and compost are also often used interchangeably. Fulvic acid, which is a smaller component of humic matter, is sometimes used as a synonym. While the terms may differ, they all refer to a substance that is essential to soil health and agricultural productivity. Farmers and gardeners understand the importance of this substance, and often add organic matter to their soil to enhance its fertility and structure.