What types did people use to build favela?

People commonly used a variety of materials to build favelas, including concrete, bricks, wood, and corrugated metal. Many structures are constructed with salvaged or recycled materials due to economic constraints. The informal nature of favelas often leads to a haphazard architectural style, reflecting the resourcefulness and creativity of the residents. Additionally, local building techniques and designs are adapted to the unique topography and climate of the area.