Charvaka in the context of "Pancha Bhuta"

In Indian religions and philosophies, a śramaṇa (from Sanskrit) or samaṇa (from Pali), sometimes anglicised as shramana, is a person "who labours, toils, or exerts themselves for some higher or religious purpose" or a "seeker, or ascetic, one who performs acts of austerity".

In the early Vedic texts, the term is an epithet for the great rishi sages in association with their ritualistic exertion. However, it has since come to refer to a broad class of spiritual movements originally comprising wandering ascetics from ancient India—collectively called the Śramaṇa tradition, Shramanic tradition, or occasionally Shramanism—historically parallel to but distinct from the Vedic religion, Brahmanism, and their Hindu successor movements. The Śramaṇa tradition includes Jainism, Buddhism, and others such as the Ājīvika, Ajñana, and Cārvāka, while definitively excluding Hinduism. The tradition's name comes from the semantic narrowing of the term śramaṇa to mean a religious individual who specifically rejects the authority of the Vedas; however, the word did not hold this connotation until certain post-Vedic texts considered canonical by Buddhists and Jains. Similarly, in Indian philosophy, the terms āstika versus nāstika largely equate to this distinction between Vedic versus non-Vedic belief systems.

Ajita Kesakambali (Sanskrit: अजित केशकंबली; Chinese: 阿耆多翅舍欽婆羅; pinyin: Āqíduō Chìshěqīnpóluó) was an ancient Indian philosopher in the 6th century BC. He is considered to be the first known proponent of Indian materialism, and forerunner to the Charvaka school. He was probably a contemporary of the Buddha and Mahavira. It has frequently been noted that the doctrines of the Lokayata school were considerably drawn from Ajita's teachings.

Indian philosophy, the systems of thought and reflection that were developed by the civilizations of the Indian subcontinent. They include both orthodox (astika) systems, namely, the Nyaya, Vaisheshika, Samkhya, Yoga, Purva-Mimamsa (or Mimamsa), and Vedanta (Advaita, Dwaita, Bhedbheda, Vishistadvaita), and unorthodox (nastika) systems, such as Buddhism, Jainism, Ajivika, Ajnana, Charvaka etc. as well as other schools such as Raseswera, Paninya, Pratyabhijna, Pasupata Shaivism, Shaivism etc. Indian thought has been concerned with various philosophical problems, significant among which are the nature of the world (cosmology), the nature of reality (metaphysics), logic, the nature of knowledge (epistemology), ethics, and the philosophy of religion etc. Some of the most famous and influential philosophers of all time were from the Indian Subcontinent such as Buddha, Nagarjuna, Adi Sankara, etc. This list is until 14th century CE.