The glycocalyx is a fuzzy-appearing layer found on the surface of many cells, primarily composed of carbohydrates and proteins. It plays a crucial role in cell recognition, protection, and communication. The glycocalyx helps cells adhere to surfaces and each other, which is important for tissue formation and immune responses. In addition to its structural functions, the glycocalyx also acts as a barrier, regulating the movement of substances in and out of the cell. It is involved in various biological processes, including cell signaling and cell adhesion, and is particularly prominent in endothelial cells lining blood vessels.