The primary characteristic that defines a biome is its distinct climate and vegetation type, which support specific plant and animal communities. Biomes are large ecological areas that share similar environmental conditions, such as temperature, precipitation, and soil characteristics. Examples include tropical rainforests, deserts, and tundras. The interactions between climate, geography, and living organisms within these regions shape their unique ecosystems. Understanding biomes is crucial for assessing regional biodiversity, as well as for conservation efforts aimed at preserving these diverse habitats.