It's a photo of how the thread worked and who responded to whom. When you're ill and looking at copy/pasting a bunch of stuff and a thread has too much info for a simple word doc to make sense later - this is very helpful. I've done it with award threads that were so chocked full of info I wanted to keep them forever. It's virtually printing it so you don't have to go through copy paste or type who said what. Very helpful for brain fog.