The Chorus Section
The hook is generally included in the chorus section, because it directly addresses the hook's information with each line. Sometimes the chorus simply restates the message presented in the hook. At other times, the chorus may be a list of ideas that culminates in the hook.
The chorus usually appears two or three times during the song and contains the most important information, so it needs to be even tighter and catchier than the other parts. The most wonderful verse you've ever written would probably get boring if you used it three times in the same song. The chorus needs to be absolutely bulletproof to make a listener want to hear it again and again.
Lyrically, chorus information is sometimes more abstract than verse information and is often a philosophical statement or moral of the story supported by the verses. It's usually presented in a leaner and more compact style than that of the verses. A simpler meter with longer notes and less syllables can help keep this density from bogging down the chorus or making it too heavy. If the other parts of the song have done their jobs, the transition to a different type of information and style of presentation should be logical and easy.
From a musical standpoint, the chorus should sound big and memorable. Ideally, the chorus should be easy for listeners to sing along with. This makes your song interactive by letting the listener participate and also makes it easier for a listener to remember the song; it's much easier for a person to remember something they did than something they only heard.