The study of small, mostly unicellular organisms is called Microbiology. The study of their interactions in wild is called Microbial Ecology.
Microbiology is the study of all the microorganisms like bacteria, viruses, fungi, slime molds, archaea, etc. The study includes all the aspects of microorganisms like their morphology, anatomy, their classification, the role they perform, the diseases caused by them, how they are caused, the benefits they provide, etc.
Microbial Ecology is the study of the interactions of all the living components with each other, with the abiotic factors as well as the large multicellular organisms. Its main focus lies upon the habitat where a microorganism is present in and the role it performs there.
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