Difference between usefull microbes and harmful microbes?

Useful microbes, such as bacteria and yeast, play essential roles in processes like digestion, fermentation, and nutrient cycling, contributing to human health and ecosystem balance. In contrast, harmful microbes can cause diseases in humans, animals, and plants, leading to infections and other health issues. While both types of microbes exist in various environments, their impact varies significantly based on their interactions with hosts and ecosystems. Overall, the distinction lies in their beneficial versus detrimental effects on health and the environment.