There are a variety of bodies designed to instill, preserve and update the knowledge and professional standing of teachers. Around the world many governments operate teacher's colleges, which are generally established to serve and protect the public interest through certifying, governing and enforcing the standards of practice for the teaching profession.
What do government's run that affects teachers? Why would a teacher's college exist? Who would a teacher's college be protecting? Who is taught at teacher's colleges? Teacher's colleges certify, govern and enforce what for teachers?