What is the general way to fix these gaps?

Hello, I am a student working on a research project related to CAD and I would like some advice on how CAD users fix these types of defects.

https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/b/c/f/bcf6dc329020db2562bf5d34f2990e18cadab4b4.png

I’ve noticed that in GrabCAD I could find these models with misaligned patches. I was able to fix them with !_JoinEdge in Rhino8. I am not experienced in CAD.

I would like to know the following:

1 Is there a name for these gaps between untrimmed parametric patches?
2 Is this a common issue that CAD users experience?
3 How would you normally go to fixing them (what commands do you use)
4 Is there existing software that automatically fixes them (without having to selected edges or patches)?