A microbe is a tiny organism that might be a single cell or a colony of cells.
Because of their minute size, they cannot be seen with naked eyes.
They can be found in water, air, soil, and inside our bodies and those of other animals and plants.
They can be found deep within geysers (thermal vents) where temperatures can reach 100°C and deep in the soil, under several meters of snow, and in highly acidic settings.
Protozoa, bacteria, fungi, minuscule animal and plant viruses, viroids, and proteinaceous infectious agents are all examples of microbes.