The entire world is divided into six biogeographic regions. The organisms found in these regions are adapted to the climate of these regions. Certain kinds of organisms are common to all regions while some are restricted to certain regions only.
For example, elephants are found only in Asia and Africa and nowhere else in the world. Grass is found all over the world.
India has two biodiversity "hotspots" - the Western Ghats and North Eastern regions (including Eastern Himalayas). Hotspots are regions of the world where many different kinds of organisms live. Many of these organisms are not found elsewhere. For example, many species of frogs live only in the Western Ghats of India.