Fermentation vessels are containers used in the process of fermentation, where microorganisms like yeast or bacteria convert sugars into alcohol, gases, or acids. These vessels can be made from various materials, including glass, stainless steel, or plastic, and are designed to create an optimal environment for fermentation. They often have features like airlocks to allow gases to escape while preventing contaminants from entering. Different types of fermentation vessels are used depending on the specific fermentation process. For example, wine is typically fermented in large barrels, while beer is often brewed in smaller tanks. The choice of vessel can influence the flavor and quality of the final product.