What is the term for bacteria that we intentionally use for beneficial purposes?

The term for bacteria that we intentionally use for beneficial purposes is "helpful bacteria." These microorganisms play a crucial role in various applications, such as fermentation in food production, enhancing soil health in agriculture, and aiding in digestion within the human gut. Helpful bacteria, or beneficial bacteria, are specifically cultivated for their positive contributions, making them integral to food technology and other fields.

In contrast, the other types of bacteria listed serve different functions that are not focused on beneficial applications. Detrimental bacteria are typically harmful and can cause diseases, while pathogenic bacteria specifically refer to those that lead to infections and illness. Spoilage bacteria are known for causing food to deteriorate and become unsafe or unpalatable, which is the opposite of what helpful bacteria aim to achieve.