A vacuum sealer is a kitchen appliance designed to remove air from bags or containers before sealing them 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 work by creating a tight seal around the food, which reduces the amount of oxygen that can reach it. Many vacuum sealers come with special bags that are designed to withstand the sealing process. They are popular among home cooks and those who want to extend the shelf life of their food, making them a valuable addition to any kitchen.