If you mean Mahāvratas in Jainism, they are the five great vows followed by Jain monks and nuns: Ahimsa (non-violence), Satya (truth), Asteya (non-stealing), Brahmacharya (celibacy), and Aparigraha (non-possession/non-attachment). They are called “great vows” because they are observed very strictly by ascetics. ( jainworld.com)

In simple words, Mahāvratas are the highest code of conduct for a Jain renunciant. ( jainworld.com)