Definitions

Microbiota: All the microbes (archaea, bacteria, fungi, viruses, etc.) present within an ecosystem/habitat. A collective study of these microbes in the gut is called the gut microbiome, and at the skin, it is called skin microbiome. 

Microbiome: Collective genomic, protein, or metabolite content of all the microbes in a given ecosystem/habitat, e.g., the microbial community in the gut is called gut microbiota. 

Healthy microbiota: A diversified microbiota present in a healthy state responsible for maintaining homeostasis of host physiology including the immune system. It is characterized by a diverse microbial community, which is stable, shows resistance and resilience, and maintains immune homeostasis by keeping a balance between pro-and anti-inflammatory responses. 

Dysbiosis: Alteration of microbiota from a healthy state; it is characterized by lower resistance and resilience ability, shifting the immune balance toward an inflammatory phenotype.