A production report is exactly what you’d expect— a report on what the production did that day. Usually, it’s filled out by the ADs at the end of the day, and double-checked by the production office in the morning.
It includes key information like call, lunch, and wrap times, the number of scenes, pages, and minutes shot, and the in and out times for every member of the cast and crew.
It is, put simply, the most mechanical, reductive, numerical representation of the creative art of cinema.
Often referred to by the abbreviation: PR.