This is a crochet stitch which looks like stocking stitch which you knit. It is also called waistcoat stitch. It is a great stitch to use when you want to emulate the knitted look and you don't want to or can't knit. In recent times it is used to make hats and beanies as well as jackets. With thicker yarn it would make bags or cushions. This is a good video because you find out straight away how to use two colours and that automatically makes the stitch more flexible and will give you ideas of what you can do with it.