Ascomycota is a Division/Phylum of the kingdom Fungi.

This group is of particular relevance to humans as sources for medicinally important compounds, such as antibiotics and for making bread, alcoholic beverages, and cheese, but also as pathogens of humans and plants.

Familiar examples of sac fungi include morels, truffles, brewer’s yeast and baker’s yeast, dead man’s fingers, and cup fungi.

Above is a sampling of ascomycete fungi grown on agar plates.

Quoted text via Wikipedia.
Photo by David Midgley of the University of Sydney on Wikimedia Commons.