A venetian blind is made with horizontal material, usually metal, timber or sythentic wood look blades. They're assembled with string ladders and can be operated by tilting the blades to let in more or less light.
Venetian blinds are always in demand and often used to compliment shutters. They have a similar horizontal look and can look similar from outside a home. The synthetic timber look venetians can be put in a bathroom or wet area and wiped down if they get wet, unlike roller blinds. Although they don't have the same popularity as roller blinds, they're still used in the right situations.