Elizabeth and Jane are alone, and we learn that, although Jane has not been outwardly very expressive about her feelings towards Mr. Bingley, she really does like him a lot.
We learn a major difference between the sisters: Jane does not think highly of herself but thinks very highly of other people, whereas Elizabeth is more realistic in her views of others.
Jane claims to have liked Mr. Bingley's sisters, and while Elizabeth does not reply, we learn that she thinks the sisters to be proud and conceited.
Basically, the Bingley sisters are snobs.
We then transition to descriptions of Mr. Bingley and Mr. Darcy.
We learn from the narrator that both are good men and very good friends, but that Mr. Bingley tends to like people and be liked in return, while Mr. Darcy tends to be very haughty. (No wonder most people dislike him.)
Mr. Darcy, however, usually has much better judgment.
Their opinion of the crowd they met at the ball reflects these differences in their characters. Mr. Bingley claims to have never met a more agreeable, good-looking crowd of women (Jane in particular), while Mr. Darcy argues that he saw little beauty or fashion at the ball. He admits that Jane is very pretty, but that she smiles too much.