EDEKA is a supermarket chain. In contrast to LIDL, it is not a discounter, so the prices are higher, but on the other hand, it offers a greater variety of products and brands.
The nearest EDEKA store is right next to U-Bahn station Nollendorfplatz.
A very convenient feature of EDEKA are its opening hours: from Monday 7:00am until Saturday 11:30pm, it is open all around the clock. You can go on a party on Friday night (of course you can go to parties on every other day of the week too) and do grocery shopping at 4:00 in the morning (Yes I know, good parties usually go on until at least 9 in the morning and every other grocery store would be open at that time, but you get the point right?).