The primary purpose of the cell wall in plants is to provide structural support and protection. Composed mainly of cellulose, the cell wall gives plants their rigidity and defines their shape. It plays a crucial role in maintaining turgor pressure, helping plants withstand external pressures and preventing wilting. Additionally, the cell wall acts as a barrier against pathogens, contributing to the plant's defense mechanisms. The integrity of the cell wall is essential for overall plant health and growth, influencing processes such as nutrient transport and cell communication.