The document discusses bricks, which were first made in ancient Mesopotamia around 4000 BC. Bricks are a building material used to make walls, pavements, and other structures. The document covers the classification of bricks as a specialty product, their nature as a generic product, and introduces their use in construction. It also lists the types of bricks, discusses product development strategies, and provides examples of brick usage like the Great Wall of China which used 8 million bricks.