DRC+ (deserved runs created plus) works similarly to FanGraphs wRC+ and Baseball-Reference’s OPS+. It takes a player’s offensive production, weighs it based on factors like their home stadium, and then puts it on a 100 scale. A player with a 100 on any of these three scales is considered an “average” hitter by that metric. If they score a 120, they produced 20% more offense. If they score an 80, they produced 20% less.
For a crash course on DRC+, these links are a good start (1, 2). In short, the main differences that we know right now are DRC+ weighs park factors differently than the other metrics and they take the pitcher faced into account.