We created “microorganisms”. We named them and decided what type of microorganisms they were. We also discussed how microorganisms are classified. Technically a microorganism or microbe is an organism that is microscopic. The study of microorganisms is called microbiology. Microorganisms can be bacteria, fungi, archaea or protists. The term microorganisms does not include viruses and prions, which are generally classified as non-living.