A Geosynthetic Clay Liner (GCL) is a composite material used primarily for environmental protection and containment. It consists of a layer of sodium bentonite clay sandwiched between two geotextiles or a geotextile and a geomembrane. This design allows GCLs to effectively prevent the migration of liquids, making them ideal for applications like landfill liners and pond liners. GCLs are lightweight and easy to install, which reduces construction time and costs. They are often used in conjunction with other materials, such as geomembranes, to enhance their performance. Their ability to self-heal when punctured makes them a reliable choice for various civil engineering projects.