Concrete block walls are constructed using concrete blocks, which are large rectangular units made from a mixture of cement, water, and aggregates. These blocks are known for their durability and strength, making them a popular choice for both residential and commercial buildings. They provide excellent insulation and can withstand various weather conditions. The construction process involves stacking the blocks in a staggered pattern and using mortar to hold them together. This method creates a solid wall that can support heavy loads. Additionally, concrete block walls can be finished with various materials, such as paint or siding, to enhance their appearance.