Biotic and Abiotic are two factors in an ecosystem.
If a pond is taken as an example of an ecosystem that one can easily understand ; then==
1 ) Biotic or living factors in that pond are = Fishes, aquatic plants, algae snails , slugs , and micro-organisms . Insects that visit the plants / flowers for pollination , fungi that bring about decomposition of dead organic mater are all Biotic.
2 ) Abiotic or non-living factors are = Soil / mud at the bottom,
water in the pond , its temperature and pH , the dissolved gases in the water , Sun shining in the sky and providing light.
These are all Abiotic .