Damascus pattern is the visible swirl or layered figure on a blade produced by forge-welding different steels together and etching the finished blade. It is a construction method, not a single alloy, so no one can tell you what a Damascus blade cuts like from the word alone.
Two or more steels with different alloy content are stacked, forge welded, drawn out and folded, then the finished blade is etched. The acid attacks the steels at different rates, so the layers show as light and dark bands. Twisting and manipulating the billet before grinding produces the patterns people buy it for.
Because the performance depends entirely on which steels went into the billet and how it was heat treated, "Damascus" tells you about appearance, not about edge retention or toughness.
A genuine pattern-welded blade has the pattern all the way through the steel. A printed or acid-etched imitation has it only on the surface, and sanding through it removes it.
The quick check is the edge bevel: on a real Damascus blade the pattern continues right down the freshly sharpened bevel. On a surface imitation, the bevel is plain.
The term is not academic here. 63 of the products currently on our shelves describe this feature in their own manufacturer specifications, across 5 of the nine brands we stock. Examples in stock right now include Kershaw Lucha Damascus, Böker Plus Urban Trapper Linerlock, Case Kinzua Framelock Orange.
Everything below is pulled live from the catalog, so what you see is what is actually in the Woodlawn warehouse today.