Fastening off is a technique used in crocheting to secure the last loop of yarn and prevent it from unraveling. It involves inserting the crochet hook into the last loop on the hook, hooking the yarn, and pulling it through the loop. This creates a knot that holds the yarn in place.
Fastening off is an essential skill for crocheters, as it allows them to finish their projects securely and neatly. Without fastening off, the last loop of yarn would be loose and could easily come undone, ruining the project.