A vacuum sealer is a device 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 in homes and commercial kitchens to extend the shelf life of various foods, including meats, vegetables, and leftovers. These machines work by creating a tight seal around the food, which reduces the amount of oxygen that can reach it. Many vacuum sealers come with different settings for various types of food, making them versatile tools for food storage. They are also popular for sous vide cooking, where food is cooked in a water bath at precise temperatures.