The topic or theme i noticed about Charlotte's Webb was Friendship.  I think in Charlotte"s Web, it was mostly about Friendship because of all the friends Wilbur has.  He seems to have change because as he was at the barn he didn't like it.  He was also all down and sad about how he was lonely.  when he met Charlotte he seemed to have changed and open up more around her.  To me Charlotte and fern are mother figures are major supporting characters, when Fern was there when Wilbur was growing up. and when Charlotte was there when she heard Wilbur was gonna get killed.  Charlotte is somewhat of a great friend too, because she seems like she would take a bullet for Wilbur. 

  This is why i think the book was about friendship.  When Fern was there taking care of Wilbur when he was gonna get killed, and having to go to Fern's uncle"s barn.  When Wilbur met goose and goose had showed him to be free and outside the barn.  Templeton who was a on and off character, but he was always there with Wilbur.  Charlotte who went through life and death to save Wilbur's life, she was one of the main connection in Friendship. 

The theme of this book to me is Friendship between everyone in this book.