Cancer is the fourth of the twelve zodiac signs and is represented by the constellation Cancer, often depicted as a crab.

 

If born under this sign, you're considered to be sensitive, compassionate, protective, and intuitive. And nurturing almost anyone you consider family. 

 

Cancers are known for their care-giving nature, though on a bad day can be distant and passive-aggressive, especially when emotionally thrown.  And they love to collect things (the crab has claws).  Lots of things.  And hang onto them.