Roman brick is a special kind of brick that was used during the time of the Roman Empire, which was a really long time ago. These bricks were made by mixing together mud and other things like straw and then shaping them into rectangular blocks. After they were shaped, the bricks were baked in an oven or in the sun until they were hard and solid.
The unique thing about Roman bricks is their size and shape. They were really big and thick, which made them stronger and more durable than other bricks. They were also made with a special pattern on one side that helped them fit together tightly in a wall without needing any extra mortar or cement.
People loved using these bricks because they were so strong and could withstand a lot of pressure and weight. This meant that buildings made with Roman bricks could last for a really long time. In fact, you can still find buildings today that were made with Roman bricks over 2,000 years ago!