The pile of a rug refers to the way the fibres are finished. These are either trimmed or untrimmed (or sometimes a combination of the two) to produce the required designs in a rug.
The loops of fibre that make up the rug are left uncut. The lengths of these may vary from design to design.
The loops of fibre are cut, creating a pile on the surface of the rug.
A combination of cut and uncut loops are used to create distinctive textured designs
These rugs have interwoven, rather than knotted or tufted fibres, so they have a flat finish instead of a pile.