Multicellular systems refer to biological systems composed of multiple cells working together to perform specific functions. This can include complex organisms such as plants and animals, as well as simpler multicellular organisms like fungi. Research in this area aims to understand how individual cells communicate, coordinate their activities, and specialize into different cell types to create a functioning organism. This field of study is important for understanding development, physiology, and disease processes in multicellular organisms. Researchers studying multicellular systems often use a combination of molecular, genetic, and computational approaches to unravel the complexities of cell-to-cell interactions and tissue organization.