Plant-based preservatives are natural substances derived from plants that help extend the shelf life of food products. They work by inhibiting the growth of bacteria, molds, and yeasts, which can spoil food. Common examples include extracts from rosemary, oregano, and green tea, which contain antioxidants that protect against oxidation and degradation. These preservatives are often preferred over synthetic options because they are perceived as healthier and more environmentally friendly. They can be found in various food items, including baked goods, meat products, and beverages, providing a natural alternative for maintaining freshness without harmful chemicals.