Ranganatha in the context of "Bhudevi"

Vaishnavism (Sanskrit: वैष्णवसम्प्रदायः, romanized: Vaiṣṇavasampradāyaḥ), also called Vishnuism, is one of the major Hindu religious traditions, that considers Vishnu as the supreme being leading all other Hindu deities, that is, Mahavishnu. It is one of the major Hindu denominations along with Shaivism, Shaktism, and Smartism. Its followers are called Vaishnavites or Vaishnavas (IAST: Vaiṣṇava), and it includes sub-sects like Krishnaism and Ramaism, which consider Krishna and Rama as the supreme beings respectively. According to a 2020 estimate by The World Religion Database (WRD), hosted at Boston University's Institute on Culture, Religion and World Affairs (CURA), Vaishnavism is the largest Hindu sect, constituting about 399 million Hindus.

The ancient emergence of Vaishnavism is unclear, and broadly hypothesized as a fusion of various regional non-Vedic religions with worship of Vishnu. It is considered a merger of several popular non-Vedic theistic traditions, particularly the Bhagavata cults of Vāsudeva-Krishna and Gopala-Krishna, as well as Narayana, developed in the 7th to 4th century BCE. It was integrated with the Vedic God Vishnu in the early centuries CE, and finalized as Vaishnavism, when it developed the avatar doctrine, wherein the various non-Vedic deities are revered as distinct incarnations of the supreme God Vishnu. Narayana, Hari, Rama, Krishna, Kalki, Perumal, Shrinathji, Vithoba, Venkateswara, Guruvayurappan, Ranganatha, Jagannath, Badrinath and Muktinath are revered as forms or avatars of Vishnu, all seen as different aspects of the same supreme being.

The Ranganathaswamy Temple is a Hindu temple dedicated to Ranganatha (a form of Vishnu) and his consort Ranganayaki (a form of Lakshmi). The temple is located in Srirangam, Tiruchirapalli, Tamil Nadu, India. Constructed in the Tamil architectural style, the temple is glorified by the Tamil poet-saints called the Alvars in their canon, the Naalayira Divya Prabhandam, and has the unique distinction of being the foremost among the 108 Divya Desams dedicated to the god Vishnu. The Srirangam temple stands as the largest religious complex in the world in active worship with a continuous historical presence as a Hindu temple. Some of these structures have been renovated, expanded and rebuilt over the centuries as a living temple. The latest addition is the outer tower that is approximately 73 metres (240 ft) tall, which was completed in 1987 with support from the Ahobila mutt among others. The temple is an thriving Hindu house of worship and follows the Tenkalai tradition of Sri Vaishnavism, based on the Pancharatra agama. The annual 21-day festival conducted during the Tamil month of Margali (December–January) attracts 1 million visitors. The temple complex has been nominated as a UNESCO World Heritage Site, and is in UNESCO's tentative list. In 2017, the temple won the UNESCO Asia Pacific Award of Merit 2017 for cultural heritage conservation, making it the first temple in Tamil Nadu to receive the award from the UNESCO.

It is among the most illustrious Vaishnava temples in the world, rich in legend and history. The deity finds a mention in the Sanskrit epic Ramayana which is dated well before 3000 BCE which also pushes the existence of deity to the same era. The temple has played an important role in Vaishnava history starting with the 11th-century career of Ramanuja and his predecessors Nathamuni and Yamunacharya in Srirangam. Its location, on an island between the Kollidam and Kaveri rivers, has rendered it vulnerable to flooding as well as the rampaging of invading armies which repeatedly commandeered the site for military encampment. The temple was looted and destroyed by the Delhi Sultanate armies in a broad plunder raid on various cities of the Pandyan kingdom in the early 14th century. The temple was rebuilt in the late 14th century, the site fortified and expanded with many more gopurams in the 16th and 17th centuries. It was one of the hubs of early Bhakti movement with a devotional singing and dance tradition, but this tradition stopped during the 14th century and was revived in a limited way much later.

Ranganayaki (Tamil: ரங்கநாயகி, Sanskrit: रङ्गनायकी, romanized: Raṅganāyakī, lit. 'Wife of Ranganatha'), also known by her epithet Tayar, (Tamil: தாயார், romanized: Tāyār, lit. 'Mother') is a Hindu goddess. She is the presiding goddess of the Sri Ranganathaswamy temple at Srirangam. She is the chief consort of Ranganatha, the tutelary deity of Srirangam. The goddess is regarded as a manifestation of Mahalakshmi, while Ranganatha is considered as a manifestation of Vishnu. She is also called Ranganachiyar and Periya Piratti.

Ranganayaki is venerated by the people of Srirangam and by Vaishnavas, the adherents of Vishnu. According to Sri Vaishnava tradition, she is regarded co-equal to Ranganatha himself, considered to be both the means and the end of worship to the divine couple.