"Multicellular" refers to organisms that consist of more than one cell. These cells work together to perform various functions necessary for the organism's survival. Examples of multicellular organisms include humans, plants, and animals. Each cell in a multicellular organism has a specific role, contributing to the overall health and functionality of the organism. In contrast to unicellular organisms, which are made up of a single cell, multicellular organisms can develop complex structures and systems. This complexity allows for specialization, where different types of cells perform distinct tasks, such as muscle cells for movement and nerve cells for communication.