Yeast

Yeast are little living things that are used to help make things like bread, beer, and wine. They are very tiny and you can't see them with your eyes. Yeast are actually a type of fungus, just like mushrooms.

When you mix yeast with sugar and warm water, they start to eat the sugar and produce bubbles of gas called carbon dioxide. This gas makes the dough rise or the beer and wine fizzy.

There are different types of yeast, and some are better for making bread, while others are better for making beer or wine. Yeast can also be used for making other things like yogurt, cheese, and even some medicines.

Overall, yeast are very useful little organisms that help make some of our favorite foods and drinks.