Join together represents a stitching technique that involves making small in-out stitches to securely join two material pieces together. This approach gives strength and avoids the material from fraying. The overcast can be used for a range of stitching projects, such as sewing the hem, stitching patches, or even creating quilts. It provides a clean and professional look for the finished item.

Whipstitch definition of whipstitch by The Free Dictionary