Microbiology (mikros bios logos small, live, study) study microorganisms and their activities.
Microbiology is the study of microorganisms usually less than 1 mm in diameter which requires some form of magnification to be seen clearly.
Microbiology study the that can exist as single cells, contain a nucleic acid genome for at least some part of their life cycle, and are capable of replicating that genome themselves or getting replicated with the help of host cells