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CATIA (Computer-Aided Three-dimensional Interactive Application) is a multi-platform, 3D design and engineering software from Dassault Systèmes. CATIA allows users to model, render, simulate and engineer products before they are physically manufactured. The software can be used across a variety of industries including aerospace, automotive, industrial machinery and consumer goods. Its core functionality includes part design, assembly design and drafting tools within a single integrated environment. CATIA hosts advanced functions such as generative shape design (GSD), parametric modeling, digital mock-ups for virtual testing scenarios to improve product performance validation without physical prototypes. It also integrates with other Dassault Systèmes products in their 3DEXPERIENCE platform.