Rammed earth is a sustainable building technique that involves compacting a mixture of soil, sand, and gravel into forms to create solid walls. This method has been used for thousands of years and is known for its durability and thermal mass, which helps regulate indoor temperatures. The process typically requires minimal energy and resources, making it an eco-friendly alternative to conventional construction materials like concrete and brick. Buildings made from rammed earth can be aesthetically pleasing, showcasing natural textures and colors, while also providing excellent insulation and soundproofing properties.