For the crop and straighten tool in GIMP image editing please answer the following about these features and describe and show how to use them.

What is this and when do I use this?

How do I use this? $($Illustrate$/$demonstrate in GIMP.$)$

Is this the same $($in Gimp$)$ as similar functions in Photoshop?

What do the options do$?($the options below the tool panel, high level summary is sufficient$)$