Venetian blinds: These are different from the rest because they are made of strips of plastic, metal or wood. They draw by having the strips turned simultaneously by a mechanical pulley system. They are preferred because with them, it is possible to control the amount of light coming in.
Roman blinds: Differs from roller blinds by the fact that they fold and unfold when drawn rather than rolling down or up. It is also a preference because it can be used in all types of windows.