The latest skincare must-have has been brought to you by the letter "C!" In the fall, we reported that CC creams were starting to launch stateside, following in the footsteps of the pioneer BB creams before them. Now, Clinique is launching their own ultra-hydrating version, with many of our favorite beauty brands developing more. In terms of coverage, CC creams lie between the tinted moisturizer and BB end of the spectrum, with the BB creams delivering a more opaque finish. But that's not all—in June, beauty brand Julep will continue the trend with the letter "D" when it launches its "dynamic-do-it-all" DD cream. Overwhelmed by the options? We put together a helpful guide on all of the products, and what makes each one different from the next—from primers, BB creams, CC creams, and every alphabetical variation in between. Click through our gallery to find out more.