Vernacular architecture refers to structures built by local people using traditional designs and materials from their region. Indian vernacular architecture can be classified into kachcha, pukka, and semi-pukka based on the materials used. Kachcha uses natural materials like mud and grass that require maintenance, while pukka uses durable materials like stone and brick. Semi-pukka combines both styles. Vernacular architecture can be studied through functional, ethnographic, sociological, geographic, and anthropological approaches. Key features of Kerala vernacular include dimensional standardization in temple construction and influences from temple architecture on domestic designs that evolved based on climate and available materials.