What is the difference between a "Feature Class" and an "SDE Feature Class"?
Or a "Table" and an "SDE Table"?
When browsing data in ArcCatalog, hosted on the same enterprise gdb, I see these data types listed and am not sure what the difference(s) between them are.

Also, in the attached ArcCatalog screenshot below are two line feature classes. Their icons are different. Why are different icons signifying?![enter image description here](https://i.stack.imgur.com/YXGPd.jpg)