What's the industry standard CAD software? What's

I don't exactly know much about the topic but I'd say AutoCAD seeing how it's Autodesk's and pretty much the most popular option.
I might be wrong tho.

autodesk inventor

completely depends on the field

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Cinema4D is the shit, more approachable than most 3D modelling & rendering apps out there imo

Depends:

3D Visualization:
Maya
3DS Max
Cinema 4D
Blender
SketchUp
Modo

Industrial Design (surfacing):
Alias
Rhino

ID/Mech Eng:
SolidWorks
Inventor
Pro E
Catia
Fusion 360
OnShape

There is no single driving program, it's about the right tool for the right job

>>273243
This, it depends on what you're doing.

If you're talking about drafting/building design then either it's AutoCAD, Revit or ArchiCAD.

Remember CAD just means Computer Aided Design (sometimes Computer Aided Drafting, or Drawing) so it really covers a broad meaning which goes from all kinds of engineering (structural, mechanical, industrial) to BIM (Building Information Modeling) to product design to 3D/virtual design, interior design, architectural/building design etc.