Everywhere on earth - in soils and oceans or even on and in all living beings including humans - microorganisms live together in close proximity, in microbiomes. Natural products structure these microbial communities, determine their composition and their behaviour towards the outside world. They are the language of microorganisms, the mediators of biological communication. Genome analyses suggest that bacteria, fungi and other microorganisms produce numerous natural products, only a small part of which we know. We would like to tap into this "treasure trove" of interesting compounds and examine their potential for applications, especially in medicine.