All the living and non-living things that surround an organism make up its environment. The living or the biotic components include the life forms surrounding the organism. These may include plants and other organisms (some of which may be its prey, while some may be its predators). Similarly, the non-living or abiotic things surrounding an organism include the likes of temperature, soil, moisture, wind, light, etc.
The survival and existence of the organism is dependent on its environment and its relationship with the biotic and abiotic components. An organism is able to survive in its environment, if it adapts to these conditions, else it will have to move to a different environment or it will die out. For example, deer can only survive in a grassland, if the weather & soil (abiotic components) is conducive to growth of grass, there is less competition from other deer (biotic components) and it escapes predation by tiger & other predators (biotic components).
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