Microbes are tiny organisms that include bacteria, archaea, fungi, protists, and viruses. They can form groups or communities based on their shared characteristics and functions. Here are some examples of groups of microbes:

1. Probiotics: These are live microorganisms, mainly bacteria, that provide health benefits when consumed in adequate amounts. Probiotics are commonly found in fermented foods such as yogurt, kefir, and sauerkraut.
2. Pathogens: These are microorganisms that cause disease in their hosts. Examples include bacteria like Escherichia coli and Salmonella, viruses like HIV and influenza, and fungi like Candida.
3. Decomposers: These are microbes that break down dead organic matter and recycle nutrients back into the ecosystem. Examples include bacteria like Streptomyces and fungi like Aspergillus.
4. Nitrogen-fixing bacteria: These are bacteria that have the ability to convert atmospheric nitrogen into a usable form for plants. Examples include Rhizobium, which forms symbiotic relationships with legume plants.
5. Symbiotic microbes: These are microbes that live in a mutually beneficial relationship with other organisms. For example, gut microbes in humans and animals help with digestion and provide nutrients to the host, while receiving a stable environment and nutrients in return.
6. Extremophiles: These are microbes that can survive and thrive in extreme environments, such as hot springs, acidic environments, and deep-sea vents. Examples include bacteria like Thermus aquaticus and archaea like Pyrolobus fumarii.

Overall, microbes are incredibly diverse and can form many different types of groups based on their functions and relationships with other organisms.