Vaikhānasa is one of the principal traditions of Hinduism and primarily worships Vishnu (and his associated Avatars) as the Supreme God. The followers are mainly Brahmins of Krishna Yajurveda Taittiriya Shakha and Vaikhanasa Kalpasutra. The name Vaikhānasa stands for the followers and the fundamental philosophy itself with the name derived from founder, Sage Vaikhanasa. It is principally monotheistic in its philosophy, whilst also incorporating elements which could be described as being panentheistic. Vaikhanansas principle focuses on rituals and worship of Lord Vishnu rather than the philosophy of Uttara Mimamsa, unlike Vaishnavism, the larger and more prevalent form on Vishnu worship.
Vaikhanasa bhagavath Shastra is the guiding principle for rituals in Tirumala Venkateswara temple.
The Vaikhanasa Brahmins/Vaikhanasas originated as a group of ascetics. In the Manava Dharmasastra, Manu discusses vanaprastha, forest-dweller, the third of the four asramas, stages of life, and mentions a "Vaikhanasa rule." Other ancient authorities support this reference, so it seems there was a Vaikhanasa ascetic community before the common era. They are mentioned in the Narayaniya, which is a late section of the Mahabharata of uncertain date but probably no earlier than the third century CE. Surviving Vaikhanasa sutras are no older than the fourth century CE.
Inscriptions from perhaps the eighth century CE identify Vaikhanasas as temple priests, and from the end of the tenth century they are prominently mentioned in South Indian inscriptions. Vaikhanasas were the priests of Vishnu temples. They were not merely ritual priests, but were trusted with administering the temples and their lands.
Sri Baghavad Rāmānujacharya, leader of the Shri Vaishnavas and the organiser of temple administration at Srirangam Temple, replaced the Vaikhanasa system of worship which came into practice with the Pañcaratra system {as the Pancharathra Priests who were in Srirangam relocated or moved to Melnadu [Karnataka Temples] and near Andhrapradesh due to many Muslim invasions in Srirangam - Reference Koil Ozhugu, Ganga Vijayam, Sri Araayairapadi Guruparambara Prabhavam}. During those time Vaikhanasa Priests saved the Srirangam Temple and worshipped the God with Sri Vaikanasa Agama Bagavath Shaastram. However Sri Ramanujacharya gave importance to both Vaikhanasas and Pancharathras as it is evident that he had not changed the Agama Rituals of Tirumala Tirupathi, Thirukarambanoor[Uthamar Kovil very nearer to Srirangam], Manakkal Nambi temple [Manakkal Nambi who administered Sri Vaishnavism before Sri Alavandar - Acharya/Guru of Sri Ramanujacharya], Tiruvallikeni Temple, Mylapore Sri Peiazhwar Temple which are very famous and popular SriVaishnava temples worshipped according to Sri Vaikanasa Agama rituals.