**Abstract**

Flavonoids are polyphenolic compounds and are one of the most abundant secondary metabolites present in plants. They are found in almost all vegetables and fruits. Flavonoids are of essence to plants and to man as well, due to their Medicinal and Pharmaceutical importance. Explicit understanding of the biosynthetic pathway of flavonoids is very essential. This will provide a stepwise explanation of the processes and mechanisms through which different forms of flavonoids are synthesized in plants, including the enzyme(s) responsible for each step. The importance in plants, medicine and pharmacy, of all the product(s) of each step will be emphasized.

**Keywords:** flavonoid, biosynthesis, plant, phenylpropanoid
