Fabric edges, also known as selvages, are the finished edges of a fabric that prevent it from unraveling. Selvages are usually woven or knit differently than the rest of the fabric and are often thicker and more tightly woven. Selvedges are similar to selvages, but they are usually found on heavier fabrics such as denim. They are created by folding the fabric over and stitching it together. Both selvages and selvedges are important for preventing fraying and ensuring the longevity of the fabric.