A Tunisian / Afghan crochet hook looks like a knitting needle with a hook at the end. It's sort of a cross between knitting and crochet - you effectively cast stiches onto the needle, like knitting but with only one needle, and cast them off, so you have an empty hook with a line of stiches, similar to crochet. I find it easier than "proper" crochet and it's good for blankets, scarves etc although, strangley enough, you can't use it to make an afghan blanket.....there isn't enough room because you can only cast on as many stiches as you can fit onto the crochet hook. It grows at a satisfying rate.