Osmosis
Osmosis is the name of the process in which water moves into or out of the cell membrane to maintain homeostasis.
Osmosis is the net movement of solvent substances such as water from a region of higher solvent potential to a region of lower solvent potential, through a semi-permeable membrane. During this process, the movement of solvent stops when the concentration of the two solutions becomes equal (balanced). This type of diffusion is an important process in biological systems because biological membranes are semipermeable.