Knitting: Kitchener Stitch

Kitchener Stitch (also called grafting) is a sewing technique used to invisibly join two sets of live stitches — most often the toe of a sock or the shoulders of a sweater — using a yarn needle instead of knitting needles.

It creates a seamless, continuous row of knit stitches, so it looks like the fabric was never cut or joined at all.