Gelatin is a gelling agent derived from collagen, commonly used to create jellies and other gelled desserts. In the context of alcohol and cocktails, gelatin is used to make fun and creative drinks like jelly shots or layered cocktails. It allows for the incorporation of alcohol into a semi-solid form, offering a unique texture and presentation. Gelatin can be flavored and colored to match the desired cocktail theme, and it pairs well with a wide range of spirits, including vodka, rum, and tequila. Jelly shots made with gelatin are popular at parties and events, providing a playful and innovative way to serve drinks.