It’s a computational mode in the camera. It takes an initial photo, and then a series of photos of equal length, and composites any new light on the subsequent photos on the first. In this case, from memory, it’s 5 photos at one second exposure each.
Basically, it lets you do a long exposure, without blowing out static light sources.
There’s a slight post processing change to the colour, to bring out the orange/teal effect, but it’s pretty subtle
Edit - FYI, your reply was tagged as German, which means that non german speakering lemmy users probably won’t see it, because most instances hide replies of languages the user doesn’t speak