The difference between conventional and organic produce stems from the difference in farming methods.
Organic farming: In organic farming, agricultural products are grown and processed chemical-free, focussing on natural methods as much as possible. Only manure and compost are used for fertilisation; crops are rotated, and insects, birds and traps are harnessed to battle pests. There is no use of pesticides, additives, GMOs, growth regulators and livestock feeds. Animals are fed on organic feed. Every country has its own regulations but the underlying principle of organic farming is to grow produce that does not involve the use of chemicals or genetically modified crops.
Conventional farming: Conventional farming involves the use of chemical fertilizers to promote plant growth. Pesticides, and chemical herbicides, are used; animals are fed antibiotics and growth hormones; medications are used to ensure their growth and well-being. While these steps may be more cost-effective, they can, in the long-term possibly be harmful to the environment and for human consumption as well.