Sishya

The guru–shishya tradition, or parampara ("lineage"), denotes a succession of teachers and disciples in traditional Indian culture and religions such as Hinduism, Jainism, Sikhism and Buddhism (Tibetan and Zen tradition). It is the tradition of spiritual relationship and mentoring where teachings are transmitted from a guru "teacher" (Sanskrit: गुरु) to a śiṣya "disciple" (Sanskrit: शिष्य) or chela. Such knowledge, whether it be Vedic, agamic, architectural, musical or spiritual, is imparted through the developing relationship between the guru and the disciple. It is considered that this relationship, based on the genuineness of the guru, and the respect, commitment, devotion and obedience of the student, is the best way for subtle or advanced knowledge to be conveyed. The student eventually masters the knowledge that the guru embodies.

In the early oral traditions of the Upanishads, the guru–shishya relationship had evolved into a fundamental component of Hinduism. The term "Upanishad" derives from the Sanskrit words "upa" (near), "ni" (down) and "şad" (to sit) — so it means "sitting down near" a spiritual teacher to receive instruction. The relationship between Krishna and Arjuna in the Bhagavad Gita portion of the Mahabharata, and between Rama and Hanuman in the Ramayana, are examples. In the Upanishads, gurus and disciples appear in a variety of settings (e.g. a husband answering questions about immortality; a teenage boy being taught by Yama, Hinduism's Lord of Death) Sometimes the sages are women, and the instructions may be sought by kings.

...
Wikipedia