An heirloom tomato is a variety of tomato that has been passed down through generations, often cultivated for its unique flavors, colors, and shapes. These tomatoes are typically open-pollinated, meaning they are pollinated naturally by insects or wind, allowing them to maintain their genetic traits over time. Heirloom tomatoes come in many types, including Brandywine, Cherokee Purple, and Green Zebra. They are prized by gardeners and chefs alike for their rich taste and vibrant appearance, making them a popular choice in farmers' markets and home gardens.