Whip stitch is a simple diagonal stitch in whipping/wrapping motion, and it is often used to attach two fabrics together. It can also be used as a surface stitch as shown here, and this is a very simple, effective way to create a rope effect in Beadwork embroidery.
Work a diagonal straight stitch and come up to the left of the end of the first stitch.
Work from bottom to top. It is quite open when worked in embroidery thread only.
Structure of stitch
Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.391
Shelley Cox, RSN Essential Stitch Guides: Bead Embroidery (2013) , p.81