Uracil is a nitrogenous base that plays a crucial role in the structure of RNA, or ribonucleic acid. Unlike DNA, which contains thymine, RNA uses uracil to pair with adenine. This unique feature helps RNA carry genetic information from DNA to the ribosomes, where proteins are made. In addition to its role in RNA, uracil is also involved in various metabolic processes within cells. It can be synthesized from other compounds or obtained through the diet. Understanding uracil is essential for studying genetics and molecular biology, as it helps researchers explore how genes are expressed and regulated.