What kinds of soft yeast cake are there?

* Fresh yeast: This is the most common type of yeast and is sold in the refrigerated section of grocery stores. It is a live yeast that must be activated in warm water before using. Fresh yeast is perishable, so it should be used within a few days of purchase.

* Active dry yeast: This is a dehydrated form of fresh yeast and is sold in packets or jars. Active dry yeast must be proofed in warm water before using to ensure it is active. Active dry yeast has a longer shelf life than fresh yeast, but it should still be stored in a cool, dry place.

* Instant yeast: This is a type of dry yeast that does not need to be proofed before using. It can be added directly to the dry ingredients in a recipe. Instant yeast is the most convenient type of yeast to use, but it can be more expensive than fresh or active dry yeast.