Dana Caldwell is Adam's girlfriend who Adam is always trying to impress. In the episode "Goldbergs Feel Hard", it is revealed that Dana is not going to be in the next season, as she is moving to Seattle.
Dana is a kind girl, but Beverly does not really like Dana. It is hinted that Beverly dislikes Dana because she is jealous that Adam spends time with her more than he spends time with Beverly, not because she is unkind. It is also hinted that Dana has mixed feelings towards Beverly. In season 3, when she moves to Seattle, Beverly has a nicer attitude towards her as she can not see Adam all the time.
In "Goldbergs Feel Hard", it is revealed that Dana has a father. It has also been mentioned many times that Dana and Adam are boyfriend and girlfriend.