A Kilim is a flat tapestry-woven carpet or rug traditionally produced in countries of the former Ottoman Empire, Iran, Azerbaijan and Turkic countries of Central Asia. Kilims can be purely decorative or can function as prayer rugs. Modern kilims are popular floor-coverings in Western households. Kilims are produced by tightly interweaving the warp and weft strands of the weave to produce a flat surface with no pile. Kilim weaves are tapestry weaves, technically weft-faced plain weaves, that is, the horizontal weft strands are pulled tightly downward so that they hide the vertical warp strands.