There isn't one specific name for all "good" bacteria. Instead, they are often referred to as beneficial bacteria, probiotic bacteria, or gut microbiota.

Here's a breakdown of these terms:

* Beneficial bacteria: This is a general term for bacteria that provide benefits to their host, such as aiding digestion, producing vitamins, and strengthening the immune system.

* Probiotic bacteria: These are specific strains of bacteria that are intentionally added to foods or supplements to provide health benefits. They are often found in yogurt, kefir, and fermented foods.

* Gut microbiota: This refers to the entire community of bacteria that live in our intestines. While not all bacteria in the gut are beneficial, a healthy gut microbiota is dominated by helpful bacteria.

Here are some examples of common probiotic bacteria:

* Lactobacillus: These bacteria are commonly found in fermented foods like yogurt and sauerkraut. They help with digestion and may contribute to immune system health.

* Bifidobacterium: These bacteria are also commonly found in fermented foods and play a role in digestion and immune system function.

* Saccharomyces boulardii: This yeast, not technically a bacterium, is often used as a probiotic to treat diarrhea.

It's important to remember that not all bacteria are bad. In fact, many bacteria are essential for our health.