Cell development refers to the process by which a single cell, such as a fertilized egg, undergoes division and differentiation to form various cell types in an organism. This process is crucial for growth, tissue repair, and maintaining the overall function of living organisms. During development, cells communicate with each other and respond to signals from their environment, guiding their specialization. The stages of cell development include cell division, where one cell splits into two, and cell differentiation, where cells become specialized for specific functions, such as muscle or nerve cells. This intricate process is regulated by genes and proteins, ensuring that cells develop correctly and contribute to the organism's health and functionality.