Microbes (commonly known as bacteria) include bacteria and archaea (in the past these were called primitive bacteria). The broader concept of microorganisms includes fungi (including unicellular yeasts), microscopic algae and protozoans (e.g. paramecium). These are mainly microscopically small (micro = Greek small) creatures, very often unicellular organisms and not visible to the naked eye.

In the sensitive interaction of the organisms that populate our planet, microorganisms have a key functions. Furthermore they play an important role in the alpine area: they are very cold- and UV-resistant, colonize caves, ice and snow and color glaciers red.

They are also known as symbionts of alpine animals, which could not digest their fibre-rich food without microorganisms.

Major Tyrolean companies from the pharmaceutical and food sectors use them as the basis of their business models.

Last but not least, humans harbour more microorganisms (approx. 1.3*10¹³) than they have body cells (approx. 1.0*10¹³).