Lightweight wall panels fall under the category of prefabricated building materials, specifically classified as partition wall panels or modular wall systems. These panels are made from materials like EPS (Expanded Polystyrene), AAC (Autoclaved Aerated Concrete), gypsum, or fiber cement, and are designed for quick installation, reduced structural load, and improved thermal and acoustic insulation. Common types include 3D panels, AAC panels, and sandwich panels, all used in both residential and commercial construction for internal partitions or external non-load-bearing walls.