Food tastes better. It's not official, but many say that organic foods are more flavorful. Organic produce is not bred for appearance, like conventional produce. But people should still wash their produce. Organic means that food has been grown without the use of synthetic chemical treatments, irradiation or preservatives.
Organic food is certified based on standards set state by state, by an impartial third-party agency.
Many dangerous pesticides that are banned in the U.S., are still allowed to be manufactured here and sold to other countries. Look for country of origin when you shop. Locally grown produce is fresher, lasts longer and generally has not been treated with post-harvest chemicals because there is less travel time to consumer. Buy in season. If produce is in season, it is generally grown locally.