Plied Yarn
Plied yarn is made by twisting two or more thinner strands together, giving the yarn strength, evenness, and a rounder structure.
Explanation
Most yarns are made by twisting together two or more single strands (plies) in the opposite direction from how each strand was originally spun, producing a more even, rounder, and more durable yarn than a single strand alone. The number of strands is often described as 2-ply, 3-ply, or 4-ply yarn, and affects both appearance and how the fabric behaves: yarns with more thin plies often give a smoother stitch definition, while single-ply or loosely spun yarn can give a more rustic, uneven look.