Agar is a gelatinous substance derived from red algae, commonly used as a vegan alternative to gelatin. It is often found in the form of powder or flakes and is used to thicken liquids, create gels, and as a solidifying agent in food and laboratory settings. Agar has no taste and can withstand higher temperatures than traditional gelatin, making it ideal for use in a variety of culinary applications. It is popular in Asian cuisine for desserts like jellies and puddings.