A vacuum sealer is a kitchen appliance that removes air from a bag or container before sealing it shut. This process helps preserve food by slowing down spoilage and preventing freezer burn. Vacuum sealers are commonly used for storing leftovers, marinating meats, and organizing bulk purchases. These devices come in various types, including handheld models and countertop machines. Many vacuum sealers are compatible with special bags or containers designed for vacuum sealing. By extending the shelf life of food, vacuum sealers can help reduce waste and save money, making them a popular choice for home cooks and food enthusiasts.