Dear Student, Osmosis is a type of diffusion. Osmosis is the phenomenon when the two solutions having different osmotic concentrations are separated by a semi-permeable membrane and the movement of solvent takes place from a region of low concentration of the solute to a region where there is a high concentration of the solute or from a region where there is a high concentration of solvent to a region where there is a low concentration of solvent.
There are Two Types of Osmosis-
Exosmosis: Movement of water molecules out of a cell when the cell is placed in hypertonic solution.
Endosmosis: Movement of water molecules into the cell when the cell is placed in a hypotonic solution.