Slime, or mucus, is a thick, slippery substance produced by the body, primarily found in the respiratory, digestive, and reproductive systems. It serves several important functions, including trapping dust and pathogens, lubricating surfaces, and aiding in digestion. Mucus is composed mainly of water, proteins, and carbohydrates, which give it its gel-like consistency. In humans, mucus is produced by specialized cells called goblet cells, which are located in the lining of various organs. For example, in the nose, mucus helps filter and humidify the air we breathe, while in the stomach, it protects the lining from harsh acids.