The diffusion process refers to the movement of particles from an area of higher concentration to an area of lower concentration. This natural phenomenon occurs in gases, liquids, and solids, driven by the random motion of molecules. It plays a crucial role in various scientific fields, including biology, chemistry, and physics. In biological systems, the diffusion process is essential for functions like cell respiration and nutrient absorption. For example, oxygen diffuses from the lungs into the bloodstream, while carbon dioxide moves in the opposite direction. Understanding diffusion helps explain how substances interact and spread in different environments.