Osmosis is the process by which water molecules or other solutes travel from an area of low water concentration to an area of high water concentration through a semi-permeable membrane.
Osmosis is an important process in biological systems, occurring in liquids, supercritical fluids, and gases.
Importance for living beings:
The cell membrane, which surrounds the live cells of both plants and animals, is somewhat permeable and regulates the passage of liquids, dissolved solids, and gases into and out of the cell.
Substances necessary for the cell's life are evenly dispersed in the cell's surroundings, and toxins from the surroundings enter the cell.