AutoCAD Plant 3D software allows users to design and model 3D plant layouts, generating accurate isometric and orthographic drawings. It is suited for process engineers and plant designers, providing tools for piping, instrumentation, and plant modeling. The software helps visualize designs, catch potential issues, and ensure construction drawings are correct to reduce errors and expenses during the building process. Training is important to properly use the software's full capabilities for developing customized layouts suited to different business needs.