Compare biotic and abiotic factors

Biotic: anything that's alive
Abiotic: everything that's non-living

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 .