Osmosis is a vital biological process where water molecules move across a selectively permeable membrane from an area of low solute concentration to one of high solute concentration. This movement is driven by the principle of equilibrium, as the system seeks to balance solute concentrations on both sides of the membrane. Osmosis is crucial for maintaining cellular homeostasis, allowing cells to regulate their volume and nutrient absorption. It plays a significant role in numerous biological processes, including nutrient uptake, plant turgor, and overall cellular function.