Bhakti yoga — the 'yoga of devotion' — is one of the three great upāyas (spiritual means to liberation) discussed in the Bhagavad Gītā and elaborated in Viśiṣṭādvaita Vedānta. In Rāmānujācārya's understanding, bhakti yoga is not mere affective devotion but a technically precise meditative discipline: sustained, uninterrupted (satata, nityam) contemplation (dhyāna or upāsanā) of Bhagavān's essential nature (svarūpa) and auspicious attributes (kalyāṇa guṇas), practised with the intensity of the deepest love, until Bhagavān grants the direct, unmediated vision of Himself (aparokṣa jñāna darśana). This vision itself matures into liberating bhakti that Bhagavān cannot refuse.
The prerequisites of bhakti yoga, as delineated in the Gītā Bhāṣya and Śrī Bhāṣya, are formidable. The aspirant must observe strict celibacy (brahmacharya) throughout life; practise sustained austerity (tapas); and possess śama, dama, and the other qualificatory virtues described in the Upaniṣads as prerequisites for Brahma-vidyā. The implication is stark: bhakti yoga as upāya is not accessible to all people in all circumstances. This is precisely the point the Āchāryas deploy to commend prapatti (surrender) as the path available to anyone, regardless of birth, qualification, or gender.
Rāmānuja maps bhakti yoga as a fourfold sequential process: (1) karma yoga — the performance of Vedically enjoined duties without attachment to fruit, undertaken as a means of progressively purifying the mind and cultivating a capacity for sustained attention; (2) jñāna yoga — the discriminative investigation of the threefold distinction between cit (selves), acit (matter), and Īśvara (Brahman), arriving at a clear understanding of their relationships; (3) bhakti yoga proper — the sustained meditative devotion that, once karma yoga and jñāna yoga have prepared the ground, ascends to direct vision; and (4) mokṣa — liberation into eternal kaiṅkarya in Śrīvaikuṇṭha. Each stage depends upon the completion of the previous.
Bhakti yoga and prapatti are the two principal upāyas in Śrī Vaiṣṇava soteriology, and the Āchāryas carefully distinguish them on multiple dimensions: bhakti yoga takes many lifetimes; prapatti is a single unrepeatable act. Bhakti yoga requires specific qualification; prapatti requires only genuine surrender and is open to all. Bhakti yoga depends on the devotee's own sustained effort; prapatti places the entire burden on Bhagavān. The Āchāryas do not deprecate bhakti yoga — the ecstatic intensity of the Āzhvārs' devotion represents its highest expression — but they assert that for most souls in the present age, prapatti is the appropriate and accessible path.
In popular usage, 'bhakti' is often applied loosely to describe any devotional feeling or practice — singing kīrtans, visiting temples, hearing kathā. In the technical Viśiṣṭādvaita sense, bhakti yoga as upāya is a rigorous meditative path with specific prerequisites. The broader devotional culture of the Śrī Vaiṣṇava community is more accurately described by terms such as bhagavad viṣayam anuṣṭhānam or kaiṅkarya.