The process in which the knotting is done entirely by hand is known as hand knotting. In this traditional process of crafting rugs, wool or silk is knotted one by one. The process takes a bit longer since it is done manually by hand and requires skilled artists to produce them. It is a thumb rule that more knots per square inch, the better and higher quality the rug is.
They are prepared by tying knots around the vertical or 'warp' yarns on a loom. Another fiber known as the weft, is woven through the warp between rows of the knotted yarn that make up the pile of the rug. Hand-knotted products are rather artistic but take time to create.