The document tells the story of a father encouraging his son to dream of being Batman by explaining that bats are flying mammals. The son wants to fly outside and be Batman. The next day, the father tells the son that with dreams and hard work, anything is possible. He advises the son to cherish what he has, work hard, enjoy what he does, and never give up on his dreams. The father acknowledges that one can never truly be Batman but encourages the son not to stop dreaming. The document is about the first birthday of the father's blog called Wings, where he will take the reader on the journey of his blog over the past year through its posts.