This document provides an overview of the Nalayiara Divya Prabandham, a collection of 4,000 devotional poems composed by the 12 Alvar saints. It summarizes the origins and development of the collection, including its revival in the 9th century by Nathamuni who consolidated the hymns. It also describes the main parts of the collection - Mudalayiram, Periyathirumozhi, Iyarpa, and Tiruvoymozhi - and explains that the hymns establish the supremacy of Vishnu/Narayana and the philosophy of Visistadvaita through exploring the essence of Vedic truths.