Flavonoids (or bioflavonoids) (from the Latin word flavus, which means yellow, their shading in nature) are a class of polyphenolic plant and growth auxiliary metabolites.Chemically, flavonoids have the general structure of a 15-carbon skeleton, which comprises of two phenyl rings (An and B) and a heterocyclic ring (C) Flavonoids are broadly circulated in plants, satisfying numerous capacities. Flavonoids are the most significant plant shades for blossom hue, delivering yellow or red/blue pigmentation in petals intended to pull in pollinator creatures. In higher plants, flavonoids are engaged with UV filtration, harmonious nitrogen obsession and flower pigmentation. They may likewise go about as concoction errand people, physiological controllers, and cell cycle inhibitors. Flavonoids discharged by the base of their host plant help Rhizobia in the disease phase of their harmonious relationship with vegetables like peas, beans, clover, and soy. Rhizobia living in soil can detect the flavonoids and this triggers the discharge of Nod factors, which thusly are perceived by the host plant and can prompt root hair distortion and a few cell reactions, for example, particle motions and the development of a root knob. What's more, a few flavonoids have inhibitory action against life forms that cause plant sicknesses, for example Fusarium oxysporum