The slip stitch is the shortest, simplest stitch in crocheting. Slip Stitches are used to move the yarn forward while still staying as short as possible. I use them mostly when finishing a piece to hide the end, as a border or design, and occasionally for sewing two pieces together. Slip stitches are also used within stitches themselves and to connect chain stitches to make loops. They’re usually abbreviated as “sl.st” or “sl st”, but sometimes as just “ss”.