This is probably what comes to mind when you think of yeast — and it’s the most common variety sold in grocery stores. It’s a type of dry yeast that’s granular, with a consistency similar to cornmeal. It’s a living organism that’s dormant until proofed, or dissolved in a small amount of lukewarm warm water (about 110°F). It’s then added to the rest of the ingredients, where it causes dough to rise.

Active dry yeast is typically sold in individual packets (pictured here) or small glass jars. Ours will come in a thick plastic bag. Make sure to refrigerate it after receiving it so the yeast stays fresh and active.