What term describes bacteria that are harmless and can perform useful functions?

The term that describes bacteria that are harmless and can perform useful functions is nonpathogenic. These bacteria are an integral part of various ecosystems, including the human body, where they can aid in processes such as digestion and contribute to a healthy immune system. Nonpathogenic bacteria can also be utilized in various industrial applications, such as in the production of yogurt and other fermented products.

Understanding nonpathogenic bacteria is key in fields like microbiology and health, as they play crucial roles in maintaining balance and supporting life. This is distinctly different from pathogenic bacteria, which are harmful and can cause diseases.