ADR (Automated Dialogue Replacement)
is the post-production (Meaning after it was filmed and edited) process of re-recording the original dialogue or replacing voices on a motion picture, anime or television soundtrack after filming for the purpose of obtaining a cleaner, more intelligible dialogue track. It is also called "Dubbing". Another reason for this process is for foreign distribution where the language is different as the original performance. The engineer would be in charged of running the Session according to the directions of the ADR Director, through a DAW or some sort of editing software. The engineer would also be in charge of some technical aspects and re-recording or editing the ADR. THe ADR Director would be in charged of the over all process.
Post-synchronisation is called in the UK.
http://filmsound.org/terminology/adr.htm for more understanding.