What is preservatives? Md. Saifur Rahman Natural or chemical substances which are used in a small amount to protect food from the contamination of micro-organisms. Preservatives increase the shelf-life and taste of food.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?