Possibly the best way to describe a Braumeister is as a hybrid version of brew in a bag, because mashing and boiling is done in the same vessel.
Thanks to homebrewandbeer.com member and award-winning brewer DrSmurto for this tutorial and pictures.
BIAB is the easiest and usually cheapest way to make an all-grain beer. It is growing in popularity because it is simpler and quicker than other methods of all-grain brewing and requires only one vessel, meaning it needs less investment and less room.
If you're an all-grain or partial mash brewer, after the boil there will be a large amount of coagulated proteins and hops in the wort that you need to separate before transferring the wort to the fermenter or cooling cube.