Vaishnavism (Sanskrit: वैष्णव धर्म, IPA: [ʋəiˈʂɳəʋə ˈd̪ʱərmə]) is one of the major branches of Vedism along with Shaivism, Smartism, and Shaktism. It is focused on the veneration of Vishnu. Vaishnavites, or the followers of the Supreme Lord Vishnu, lead a way of life promoting differentiated monotheism, which gives importance to Lord Vishnu and His ten incarnations.
The oldest religious text in Vedic, Rigveda, describes Lord Vishnu as the Supreme Deity in Vishnu Sooktham (1.22.20):
Rigveda mentions the Supreme Lord 93 times. Other shlokas are devoted to his faithful servants, mentioned in the scriptures as the limbs of Lord Vishnu. These minor deities include Indra, Surya, Rudra, Maruta, Vayu, Agni and Manyu.
In general, the Vaishnava Agamas describe Lord Vishnu as the "supreme being and the foundation of all existence." This is explained in Katha Upanishad 2.2.13: nityo nityanam cetanas cetananam/ eko bahunam yo vidadhati kaman, "the Supreme Being, the Personality of Godhead, is the chief living being amongst all living beings and grants the desires of all other eternal sentient beings"