Americans call them blinds AND curtains. It's a matter of where you're from and personal preference in terms. Over here in NZ, Blinds and Curtains are two very different things. Curtains are (almost always) made of fabric or other flexible material, and slide along curtain rails (as in, slide open horizontally). Commonly, you'll have two per window which slide to each side when open. Blinds are what is probably referred to as 'Venetian Blinds' elsewhere - inflexible slats linked together with strings, and stacked vertically on top of each other. They cover the window, and are pulled open by a cord which brings them closer to each other and stacks them at the top of the window (as in, bunched together vertically). So where I'm from, Curtains would cover pretty much any window covering made of cloth or sheet plastic, while blinds would refer to a cover made of wood/plastic/solid slats and cord/string. That's the differentiation, though the majority here in the U.S. seem to use them interchangeably. Also referred to as shades and drapes despite definition.