Bottle sealers are devices used to securely close bottles, preventing leakage and contamination. They come in various types, including manual and automatic models, and are commonly used in industries like food and beverage, pharmaceuticals, and cosmetics. By creating an airtight seal, bottle sealers help preserve the contents and extend shelf life. These tools can seal different types of bottles, such as glass, plastic, and metal. Some bottle sealers use heat to shrink a plastic cap around the bottle neck, while others may use corks or screw caps. Proper sealing is essential for maintaining product quality and safety, especially for items like wine, sauces, and medications.