Definition of tae kwon do for English Language Learners. : a style of fighting that originated in Korea and that uses kicks and punches but no weapons. Britannica.com: Encyclopedia article about tae kwon do.
It is also used in the baking process as a leavening agent; yeast releasing gas into their environment results in the spongy-like texture of breads and cakes. Because of its role in fermentation, humans have known about and used Saccharomyces cerevisiae for a long time.
Fresh yeast, sometimes called cake yeast or compressed yeast, is a block of fresh yeast cells that contains about 70% moisture and is commonly used by baking professionals. It's pale beige in color, soft and crumbly with a texture similar to a soft pencil eraser, and has a stronger yeast smell than dry yeast.