Production of fabric by interlacing two sets of loom .
In weaving, lengthwise yarns are called warp and crosswise yarns are called weft, or filling. Most woven fabrics are made with their outer edges finished in a manner that avoids raveling (because the weft yarn turns around instead of ending in a cut end). These edges, called selvages, run lengthwise, parallel to the warp yarns. The three basic weaves are plain or tabby (weft threads go over one warp thread, then under one), twill , and satin . Fancy weaves, such as pile, Jacquard, dobby, and leno, require more complicated looms or special loom attachments. See also Navajo weaving .