Cell development refers to the process by which a single cell, such as a fertilized egg, undergoes division and differentiation to form various types of cells 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 that guide their specialization. As cells develop, they go through stages that include cleavage, gastrulation, and organogenesis. Each stage is characterized by specific changes in cell structure and function. For example, during gastrulation, cells rearrange to form distinct layers that will eventually develop into different organs and tissues. This intricate process ensures that each cell has a specific role in the body.