Homebrewers.........whats meant by the term yeast cake? The krausen that forms on top of the fermentation?!
Answers: No, the yeast cake is the layer of yeast that settles to the bottom of your primary fermenter. It can be reused several times if properly handled and cared for, which can add up to a substantial cost savings to an avid brewer.
You can buy yeast cake, it is just a compressed form of yeast.