Concrete blocks are a building material that is used in construction to form the framework of walls, retaining walls, and other structures. These blocks are made of cement, sand, and other aggregates that are molded into a solid mass. There are many synonyms you might use to describe a concrete block, such as cinder block, cement block, breeze block, or cinder concrete block. These blocks are usually gray or beige in color and are commonly used by builders because they are relatively inexpensive and easy to work with. They are also durable and long-lasting, making them a popular choice for both residential and commercial construction projects.