Sri Vaishnavism is a branch of Hinduism that revolves around the worship and devotion of Lord Vishnu, with an emphasis on the teachings of the 12th century philosopher and theologian, Ramanuja. It is a popular form of Hinduism, especially in South India, and has a rich history and tradition of practices and rituals.

The main practices and rituals in Sri Vaishnavism are centered around the worship of Lord Vishnu and the attainment of moksha (liberation). The ultimate goal of Sri Vaishnavism is to achieve a personal relationship with Vishnu and to attain union with Him.

One of the main practices in Sri Vaishnavism is the recitation of the Ashtakshara Mantra, also known as the Maha Mantra or the Tirumantra. This mantra, "Om Namo Narayanaya," is considered to be the most powerful and sacred mantra in Sri Vaishnavism and is believed to bring devotees closer to Vishnu.

Another important practice is the daily worship of the deity in the form of an idol or image, known as vigraha. This worship, known as puja, involves offering flowers, incense, and food to the deity, as well as reciting prayers and mantras. It is believed that through this worship, devotees can establish a personal connection with Vishnu.

Sri Vaishnavism also places a strong emphasis on the performance of seva, or selfless service, as a means of devotion to Vishnu. This can include serving in temples, helping those in need, and performing acts of charity.

One of the most significant rituals in Sri Vaishnavism is the performance of the daily Sandhyavandanam, which involves reciting mantras and prayers during sunrise, noon, and sunset. This ritual is believed to purify the mind and body and bring devotees closer to Vishnu.

Another important ritual is the performance of the Thirumanjanam, or the ritual bath of the deity. This involves bathing the idol or image of Vishnu with various sacred substances, such as milk, honey, and sandalwood paste, and is believed to cleanse and purify the deity.

In addition to these practices and rituals, Sri Vaishnavism also places a strong emphasis on studying and understanding the teachings of Ramanuja, which are considered essential for spiritual growth and liberation.

Overall, the main practices and rituals in Sri Vaishnavism revolve around devotion to Vishnu and the pursuit of moksha. Through these practices, devotees seek to establish a deep connection with Vishnu and ultimately attain union with Him.