First off, JET

“Aims to promote grass roots internationalisation at the local level by inviting young overseas graduates to assist in international exchange and foreign language education in local governments, boards of education and elementary, junior and senior high schools throughout Japan. It seeks to foster ties between Japanese citizens (mainly youth) and JET participants at the person-to-person level.”

My position is an ALT, or Assistant Language Teacher.

“These participants are placed mainly in public schools or local boards of education. ALTs assist with classes taught by Japanese teachers of English (JTE) and are thus involved in the preparation of teaching materials and in extracurricular activities like English clubs or sports teams. More than 90% of JET participants are employed as ALTs.
Typical duties for an ALT:
 ・”Team teaching”, or assisting with classes taught by JTEs
 ・Assisting in the preparation of teaching materials
 ・Participating in extra-curricular activities with students”


Official JET Homepage
Wikipedia for the JET Program
I Think I’m Lost, one of many JET forums out there.