CATIA (Computer-Aided Three-Dimensional Interactive Application) is a multi-platform CAD/CAM/CAE software suite developed by Dassault Systèmes. It is used for product design, simulation, analysis, and manufacturing in various industries, including automotive, aerospace, shipbuilding, and industrial design. CATIA is widely known for handling large and complex assemblies and is especially popular in aerospace and automotive industries for creating both parts and large-scale systems.