High thread count refers to the number of threads woven together in a square inch of fabric, typically in sheets or pillowcases. A higher thread count often indicates a denser and softer fabric, which can enhance comfort and durability. Common thread counts for quality sheets range from 200 to 800, with some luxury brands offering counts above 1,000. However, it's important to note that thread count is not the only factor determining fabric quality. The type of material, such as cotton or linen, and the weave style also play significant roles in the overall feel and longevity of the fabric.