Final answer:
CATIA software consists of two main elements: CATIA and EPIC. CATIA is used for designing every part of an aircraft, while EPIC ensures proper fit of parts. The CAD system allows engineers to communicate designs and ensure compatibility.
Step-by-step explanation:
The main elements of CATIA software are Computer Graphics Aided Three-D Interface Application (CATIA) and Electronic Pre-Assembly In the Computer (EPIC). CATIA is used for designing every part of an aircraft, while EPIC is used to ensure that each designed part fits properly with all the other parts. The CAD system allows engineers to communicate their designs and ensure compatibility.