Domain rating (DR) is a website ranking metric created by Ahrefs based on the strength of the backlink profile of a specific website. It is measured on a scale from 0 to 100. It is not an absolute ranking, rather it is based on a logarithmic scale, meaning as DR increases, the difficulty of increasing your DR by 1 is substantially greater.
This is a valuable tool for competitive analysis because it gives companies a benchmark for how they size up to their competitors.
In order to increase your domain rating, not only do you need to increases the number of unique backlinks to your website, but you also need to increase the number of quality backlinks to your website.
With Pulse, you are able to use this metric to not only benchmark changes in DR, but can map exactly how many backlinks you need to gain in order to reach your competitors DR.