What is a Smalltalk “image”?

OK, I understand why the title would get edited (I couldn't think of a very good way to summarize it and "Smalltalk images are (sort of) alive" may not be very good), but I linked specifically to the second answer because that's what I found fascinating: http://stackoverflow.com/a/3617319/215168

Why did the submission link get edited to point to the question? The question and top answer (which is copied from Wikipedia) are not all that interesting I think.

It seems like there's a growing renewed interest in the tools of old (like smalltalk). Happy to see it.

Most Lisps do this as well.