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Tea is generally categorized based on processing method followed & six major types of teas are produced. White Tea, Yellow Tea, Green Tea, Oolong Tea, Black Tea & Post Fermented Tea. White Tea is least processed and unoxidized tea rich in antioxidant. Yellow Tea is also unoxidized tea which are subjected to certain degree of heat for specific period (sweltering) to convert green coloration of leaf to yellow. Green Tea is passed through steam to deactivate enzymatic activity to retain green coloration and to arrest oxidation process.Oolong Tea is partially oxidized tea and it is in between green tea & black tea. Black Tea is fully oxidized tea producing characteristic black coloration to liquor. Post Fermented Tea is partially allowed to undergo further oxidation i.e. beyond optimum oxidation period by partially arresting the enzymatic activity.