This book offers a comprehensive guide to the different sects that have emerged within Islam over the centuries. It covers the historical context in which these sects developed, beginning with the initial schism following the death of Prophet Muhammad (s.a.w.) and continuing through the subsequent ideological, political, and theological debates that led to the formation of various schools of thought. Major sects such as Sunni, Shia, and Kharijites are discussed in detail, along with lesser-known groups like the Sufis and the Ismailis. The book examines the fundamental beliefs of these sects, their interpretations of Islamic doctrine, and their contributions to Islamic culture and civilization. It also addresses how these sects interact in contemporary times, shedding light on intra-faith relations and efforts towards unity.