Yeast is extensively used in fermentation processes
There are about 30,000 species of Ascomycetes, members of the division Ascomycota, commonly called sac fungi.
The most well known members of this group, yeasts, are used to make bread and to carry out anaerobic fermentation in brewing alcohol. Although yeasts are single-celled organisms, they generally colonize and function as a unit.
They include diverse types, such as yeasts, blue and green molds, cup fungi, morels and the fungi that cause powdery mildews in plants. Sac fungi reproduce sexually by creating a specialized structure known as an ascus ( giving them their name), which is a sac at the end of a hypha. The conjugated hyphae form ascospores inside of the ascus. The ascus then bursts and releases the ascospores to be carried by wind currents.
Sac fungi can also reproduce asexually. During asexual reproduction, some hyphae, called conidiophores , bud forming numerous spores, called conidia that can be carried by wind or water. Example: Yeast