The form of endocytosis that involves transport liquid droplets or small particles is called pinocytosis, also known as cell drinking. During pinocytosis, the cell membrane invaginates and engulfs extracellular fluid and dissolved substances, forming small vesicles known as pinosomes. Pinocytosis is a non-specific process and allows the cell to take up various nutrients, ions, and other molecules from the surrounding environment. It is particularly important in certain cell types, such as macrophages and dendritic cells, involved in scavenging and immune surveillance. Unlike phagocytosis, which targets larger solid particles, pinocytosis mainly deals with smaller solutes and fluid uptake.