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.
Active dry or fresh yeast can be proofed for use in bread recipes. This is not to be confused with the fermentation process; among professional chefs, fermentation is referred to as  primary fermentation , while the second bread rise is called proofing.ctive dry or fresh yeast can be proofed for use in bread recipes. This is not to be confused with the fermentation process; among professional chefs, fermentation is referred to as  primary fermentation , while the second bread rise is called proofing.