I don't know if this is the right place to post this but, how are professional or regular products designed on the computer for manufacturing?

Do they do it by making a 3d model and then getting it made by manufacturers/plastic factories, or the process is different?

if it's by making 3d models then what kind of programs do they use. Regular 3d software like blender  ?

i also understand that you can get a 3d model printed by 3d printing services, but are they the same as mass manufacturing companies, by that they make the product by 3d models.

"sorry if my question is not clear"

How are professional or regular products designed on the computer for manufacturing?

Do they do it by making a 3D model and then getting it made by manufacturers/plastic factories, or the process is different?

If it's by making 3D models then what kind of programs do they use - Regular 3D software like blender?

I also understand that you can get a 3D model printed by 3d printing services, but are they the same as mass manufacturing companies, by that they make the product by 3D models.