How does expand fill "expand fill" work?

Question

Adobe Illustrator

What does this option give? How to see it in action?
What is the difference between expand object and expand fill ?

Answer 1

It's easier to see... create an object with a stroke and a fill and try it one by one. When you expand the stroke, it turns into a filled curve. If you expand the fill, a new curve will appear with the fill below the curve with the stroke. You disassemble the object - it will turn from a controlled object into curves. For example, if you trace a picture, you can play around with the tracing settings until you understand it. Or an interactive fill group - until you convert it to curves, you can interactively fill it with the appropriate tool.