Mechanical engineers frequently use AutoCAD, especially in HVAC and plumbing, but many industries have shifted towards 3D parametric CAD software like SolidWorks and Pro/Engineer. While AutoCAD remains valuable for legacy documentation, familiarity with parametric CAD is considered a core skill for mechanical engineers. Taking a CAD course can be beneficial, particularly for learning proper drawing conventions and techniques, which are crucial for effective communication in engineering. However, self-learning is feasible for those already familiar with basic CAD principles, and the choice of software often depends on specific industry requirements. Ultimately, understanding both 2D and 3D CAD tools enhances an engineer's capabilities in design and drafting.