Sesquiterpenes are a class of terpenes composed of three isoprene units, resulting in a 15-carbon skeleton. They are widely found in essential oils of various plants, contributing to their aroma and flavor. Common sources include ginger, chamomile, and various spices. Sesquiterpenes play significant roles in plant defense mechanisms and have been studied for their potential health benefits, including anti-inflammatory and antimicrobial properties. Their unique structures allow for a diverse range of sensory characteristics, making them valuable in culinary applications and perfumery.