Rummaging around YouTube last weekend I found this video that I thought provided a good visual as well as hand's on description of what the different gouge grinds are and what this turner found them useful for. I found it particularly useful as the turner put the different grinds through their paces on the exact same piece of wood and orientation. With so many new-turners having joined recently I thought many may find this useful:

https://www.youtube.com/watch?v=GSOMDkjwnOo