Cellular functions refer to the various activities that cells perform to maintain life. These functions include processes such as metabolism, where cells convert nutrients into energy, and protein synthesis, which involves creating proteins necessary for cell structure and function. Cells also engage in cell division to reproduce and repair tissues. Additionally, cells communicate with each other through signaling pathways, allowing them to respond to changes in their environment. This communication is crucial for maintaining homeostasis, the stable internal conditions necessary for survival. Overall, cellular functions are essential for growth, development, and overall health.