In Indian religions and society, an acharya is a preceptor and expert instructor in matters such as religion, or any other subject. An acharya is a highly learned person with a title affixed to the names of learned subject. The designation has different meanings in Hinduism, Buddhism and secular contexts.

Upanayana is a Hindu educational sacrament, one of the traditional saṃskāras or rites of passage that marked the acceptance of a student by a preceptor, such as a guru or acharya, and an individual's initiation into a school in Hinduism. Some traditions consider the ceremony as a spiritual rebirth for the child or future dvija, twice born. It signifies the acquisition of the knowledge of and the start of a new and disciplined life as a brahmacharya. According to the given community and region, it is also known by numerous terms such as janai or janea, poita/paita, logun/nagun, yajnopavita, bratabandha, bratopanayan, and mekhal. The Upanayanam ceremony is arguably the most important rite for Brahmin and Kshatriya male, ensuring his rights with responsibilities and signifying his advent into adulthood.