Question

What is gut bacteria?

Answer 1

For years, bacteria were seen as organisms to be avoided. It appears that our body already contains trillions of germs. Gut bacteria are $300 - 500$ multiple kinds of bacteria in the digestive tract, with over two million genes. They form the microbiota, or microbiome, when they're combined with other microscopic species like viruses and fungi.

Complete answer:
Every individual's microbiota is as distinct as a fingerprint. Our body's microbial composition differs from that of everyone else's. It's partly dictated by our mother's microbiota — the environment we're accustomed to from the moment we're born — and partly by our food and habits.
Bacteria can be found all over our body, but ones in our gut will have the greatest effect on our health. They coat the inside of our gastro-intestinal tract. The majority of them reside in our intestines and colon. Everything from our metabolism, to our temperament, to our defensive process is influenced by the gut bacteria. Gut bacteria aid in the breakdown of nutrients and play a crucial part in our overall health.
The ‘friendly’ bacteria in the gastrointestinal system do something besides assisting digestion. They aid in the control of ‘unfriendly’ microorganisms. They proliferate so quickly that the sick variants are unable to thrive. It's called equilibrium when your gut bacteria are in a reasonable balance.

Note:
The ‘good’ bacteria, which can be found in some foodstuffs, are similar to those already existent in our gut. They can boost the bacteria in our intestines and help maintain a healthy balance. They aren't all the same, though. Each type has its own set of characteristics and can have a variety of impacts on our body.