Geomembranes are synthetic membranes used as barriers to control fluid or gas movement in various applications. They are typically made from materials like polyethylene or polyvinyl chloride and are commonly used in landfills, ponds, and mining operations to prevent contamination of soil and groundwater. These membranes are designed to be durable and resistant to environmental factors, such as UV radiation and chemical exposure. Their installation is crucial in projects involving waste management, water containment, and environmental protection, ensuring that harmful substances do not escape into the surrounding environment.