The short answer is that loess is windblown glacial silt.

However, naturally there is much more to the topic than that.

The main place where loess itself is talked about is in the Geology Section.

But, thing is, for most of us, loess itself is much less interesting than the story behind it, and the things and people, living and nonliving, associated with it.

That's why, at this site, there's so much to explore and think about...