Helpful microbes are called beneficial microbes, probiotics, or good bacteria. They play important roles in various aspects of our lives, such as:

* Human health: They help with digestion, immune system development, and preventing infections.

* Food production: They are essential for processes like fermentation in yogurt, cheese, and bread.

* Environmental health: They decompose organic matter, fix nitrogen, and help clean up pollution.

Examples of beneficial microbes include:

* Lactobacillus: Found in yogurt and other fermented foods, it aids in digestion and supports the immune system.

* Bifidobacterium: Another common probiotic, it helps with digestion and gut health.

* Saccharomyces cerevisiae (yeast): Used in brewing and baking.

* Nitrifying bacteria: Convert ammonia to nitrates, a vital nutrient for plants.

It's important to remember that not all microbes are helpful. Some are pathogenic and can cause disease.