What type of bacteria are known as "good bacteria"?

Probiotics are known as "good bacteria" because they play a beneficial role in maintaining balance within the microbiome, particularly in the gut. These bacteria can help with digestion, enhance the immune system, and prevent the growth of harmful bacteria. They are found in various foods and supplements and are essential for promoting a healthy digestive environment.

The other options represent entities that do not typically have the same beneficial effects. Pathogenic bacteria are those that can cause diseases, and virus pathogens are viruses that lead to infections and diseases in hosts. Fungi are a separate category of microorganisms that can be beneficial or harmful, but they do not fall under the "good bacteria" classification.