The main religious premises of Jainism are ahimsa ("non-violence"), anekantavada ("many-sidedness"), aparigraha ("non-attachment") and asceticism. Jain monastics renunciants and devout householders take five main vows known as vratas, outlined in their oldest surviving text, the Acaranga Sutra: ahimsa ("non-violence"), satya ("truth"), asteya ("not stealing"), brahmacharya ("celibacy or chastity"), and aparigraha ("non-attachment"). These principles have impacted Jain culture in many ways, such as leading to a predominantly vegetarian lifestyle that avoids harm to animals and their life cycles. Parasparopagraho Jivanam ("the function of souls is to help one another") is the motto of Jainism. Namokar Mantra is the most common and basic prayer in Jainism.
Jainism has two major ancient sub-traditions, Digambaras and Svetambaras; and several smaller sub-traditions that emerged in the 2nd millennium CE. The Digambaras and Svetambaras have different views on ascetic practices, gender and which Jain texts can be considered canonical. Jain mendicants are found in all Jain sub-traditions, with laypersons (śrāvakas) supporting the mendicants' spiritual pursuits with resources.
Jainism has between four and five million followers, with most Jains residing in India. Outside India, some of the largest Jain communities are present in Canada, Europe, Kenya, the United Kingdom, Hong Kong, Suriname, Fiji, and the United States. Major Jain festivals include Paryushana and Daslakshana, Mahavir Jayanti, and Diwali.
The principle of ahimsa (non-violence or non-injury) is a fundamental tenet of Jainism. It believes that one must abandon all violent activity, and without such a commitment to non-violence all religious behavior is worthless. In Jain theology, it does not matter how correct or defensible the violence may be, one must not kill any being, and "non-violence is one's highest religious duty".
Jain texts such as Acaranga Sutra and Tattvarthasutra state that one must renounce all killing of living beings, whether tiny or large, movable or immovable. Its theology teaches that one must neither kill another living being, nor cause another to kill, nor consent to any killing directly or indirectly. Furthermore, Jainism emphasizes non-violence against all beings not only in action, but also in speech and in thought. It states that instead of hate or violence against anyone, "all living creatures must help each other". Violence negatively affects and destroys one's soul, particularly when the violence is done with intent, hate or carelessness, or when one indirectly causes or consents to the killing of a human or non-human living being.
The idea of reverence for non-violence (ahimsa) is founded in Hindu and Buddhist canonical texts, and it may have origins in more ancient Brahmanical Vedic thoughts. However, no other Indian religion has developed the non-violence doctrine and its implications on everyday life as has Jainism.