What is a cancer and is it the best sign?

Cancer is the 4th sign of the zodiac. Represented by the crab. Cancers rarely open up to others. They are friendly, hardworking, and, intelligent. There isn't a "best" sign of the zodiac (try looking up natal charts and rising signs and moon signs). Cancers are compatible with Virgo <~quite possibly the best sign, if there was one :) and Taurus. Hope this helps:)