Jain vegetarianism is when people who follow the Jain religion don't eat meat, fish, eggs, or any foods that come from animals.
Jains believe that all living beings have souls, which are called jivas. They believe that these jivas are all equal, whether they are humans or animals, and that all living beings should be treated with respect and kindness.
So, Jains don't want to hurt animals or cause them any harm. They also believe that eating meat or other animal products can harm their own souls, because by eating them, they are supporting the killing and harming of other living beings.
Jain vegetarianism is not just about what they eat. Jains also try to avoid harming any living things, so they may also avoid wearing leather, silk or fur. They also try to limit their use of electricity and water, because they believe that these resources also have living energies.
In summary, Jain vegetarianism is a way of life that is based on showing kindness and respect to all living beings, and avoiding anything that could harm them.