The DC New 52 was a major relaunch by DC Comics in 2011, featuring 52 new series. Here are some key series from the New 52 lineup:
This relaunch aimed to revitalize and modernize the DC Comics universe following the "Flashpoint" crossover event. For a complete list and more information, you can visit the Wikipedia page on The New 52.
These series, among others, marked a fresh start with new storylines and character designs.