What do you understand by a biome? Provide an account of the major biomes of the world and their characteristics.

What do you understand by a biome? Provide an account of the major biomes of the world and their characteristics.
बायोम से आप क्या समझते हैं? विश्व के प्रमुख बायोम और उनकी विशेषताओं का विवरण दीजिए।