There are millions of species of living organisms on the planet Earth and it is very difficult to study the features of these organisms one by one.So in order to make this  study easy scientists put forward the idea/procedure of classification. Classification is defined as the procedure  in/by  which similar organisms are kept together in same groups and dissimilar organisms are put in different groups .Since it deals with living organisms it is also known as biological classification. Carolus Linnaeus is known as father of taxonomy.   Different biologist`s classified organisms in different ways .  Carolus Linnaeus  classified organisms into Kingdoms in 1758 . He classified them into two kingdoms viz.Kingdom plantae and kingdom animalia .In kingdom plantae he put plants and plant-like organisms e.g Bacteria , fungi, algae,slime moulds,flowering plants, gymnosperm, ferns,mosses,and lichens.In kingdom animalia  he put animals and animal-like organisms e.g protozoa, sponges,worms,insects,molluscs,jelly fishes, fishes,frogs,snakes,birds, and mammals.