Plants are source of innumerable elegant compounds with diverse biological activities. The useful natural products are obtained by the numerous biochemical reactions in diverse species. The interactions of organisms with their environment and among themselves for survival and natural selection generate a variety of primary and secondary chemical substances that maintain their existence and fitness. Humans have been utilizing this repertoire of diverse primary and secondary biochemical products for their health care and other essential purposes to survive. Natural plants are affluent storehouse of bioactive molecules which are individually and/or cumulatively used as herbal remedies to cure several ailments. Natural products from whole plants, parts, exudates, in pure and isolated form are of primary importance for treating human diseases. For primary health care developed countries which depend on allopathic specific medicines are also increasingly consuming these natural compounds and traditional medicines of plant origin due to their less side effects and better compatibility.