Cellular growth refers to the process by which cells increase in size and number. This growth is essential for the development, maintenance, and repair of tissues in living organisms. Cells grow through a series of stages, including the cell cycle, which consists of phases such as interphase and mitosis. During interphase, cells prepare for division by replicating their DNA and increasing their organelle content. In multicellular organisms, cellular growth is regulated by various factors, including growth factors and hormones. These signals ensure that cells grow and divide at the appropriate times, contributing to overall health and development. Abnormal cellular growth can lead to conditions such as cancer, where cells divide uncontrollably.