What are diffusion and osmosis both types of?

Diffusion and osmosis are both types of passive transport processes that involve the movement of molecules across cell membranes. Diffusion refers to the movement of solute particles from an area of higher concentration to an area of lower concentration until equilibrium is reached. Osmosis specifically involves the movement of water molecules through a selectively permeable membrane, also from an area of higher water concentration (or lower solute concentration) to an area of lower water concentration (or higher solute concentration). Both processes do not require energy input from the cell.