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Reverse Osmosis is a membrane separation process in which the solvent (water) molecules from a pressurized solution flow through a semi-permeable membrane.
RO process is generally used for desalination of water. The permeate (the liquid flowing through the membrane of purified water) which generally emerges at near atmospheric pressure, is reduced in salt content, while the feed solution which is pressurized on the other side of the membrane increase in the feed.
Unlike thermal desalination, membrane desalination operates at ambient temperature and without a phase change, and hence energy consumption for membrane desalination is lower compared to thermal desalination. This process at times is also referred to as Hyper filtration. | 
