The provisional cast on is, as the name implies, a temporary cast on row. It is done with waste yarn so that you can take it out later and have “live” stitches in your working yarn.
Also known as the slingshot cast on, this technique is fast and creates a neater look than your basic cast on. Long tail cast on stitch knitting
Great Eastern Entertainment Blue Exorcist Rue Cross Academy Wall Scroll, 33 by
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Provisional cast-on for seamless grafting
Simple to make and perfect for protecting hands from the heat.
How to Do the Long Tail Cast On - Lion Brand Notebook
Loom Knit Diagonal Baby Throw by Lion Brand Blanket or Washcloth (CC Closed Captions)