Software that runs without external intervention, taking raw data on one end and producing reduced data in the other.
Software that does nothing until data arrives, and then looks to the data and not the user for data reduction information.
A file containing a list of individual data reduction steps.
A file containing code performing a meaningful data reduction step
An external package (e.g. a Starlink task) that performs a certain algorithmic step (e.g. addition).
ORAC-DR: Overview and General Introduction