system
Given the following post, respond as if you're commenting on Reddit:
human
[SCP] What's the difference between data being expunged, redacted and blacked out?
gpt
To expunge is the removal of the data. Either the data was not appropriate for the document or the information was a danger in itself. 

To redact is to censor a text for publication. It's mostly used for files that can be spread a tad liberally, possibly to class-D's that really have no possibility of leaking the information, but don't really need the complete picture to do their jobs.

Blacked out words means the file is above your clearance. Work your way up and you might come across that file again without black bars.