You can say:

Jainism is an ancient Indian religion that teaches non-violence, truth, self-discipline, and respect for all living beings. Its main goal is to free the soul from karma through right faith, right knowledge, and right conduct. Jains strongly practice ahimsa—not harming any living being in thought, word, or action. They also value non-attachment, simplicity, and self-control. The religion is guided by 24 Tirthankars, with Lord Mahavir being the most well-known. Jainism teaches that every soul can become pure and liberated through spiritual discipline and compassionate living.

If you want, you can also use this shorter classroom version:

“Jainism is a religion of peace and non-violence that teaches people to live simply, speak truthfully, avoid harming living beings, and purify the soul to reach liberation.”

If you'd like, I can also make it into:

• a 30-second speech
• a 3-sentence version
• or a student-friendly paragraph for presentation.