Give me points on yeast microorganisms?tell me about yeast microorganisms?

Yeast is a microorganism because a cell of it is too small to be seen by the un-aided eye. A microscope is needed to look at it.It is also a fungi.
If you can only see a living thing with a microscope, that means it is a microorganism. These are found everywhere.
Some of them, like yeast are helpful. And some of them are harmful and disease causing, like bacteria. It is important to know how to avoid spreading the bad ones!