The Darning Stitch is about making rows of straight Running Stitches near each other. The darning technique mends torn clothes, especially socks, and looks like a woven patch. A fabric is made of weft and warp yarn. A weft is a yarn that runs vertically, while a warp is the one that runs horizontally. They interlock with each other to form the fabric. While mending torn fabric, the Darning Stitch is used to ‘rebuild’ the weft and warp of the worn-out area.