A document or text that's been redacted has had some parts removed or hidden, often to keep private information secret. The person doing the editing might leave behind some clues as to what was censored.
Imagine you're reading a police report about an ongoing investigation. You don't want the suspects' names revealed to protect their rights and the integrity of the case. So, a redactor would take out those sensitive details before releasing the document. Sometimes, even whole sections get removed or replaced with something like "X" or "BLANK" to prevent anyone from figuring out what was there originally.
To censor, to black out or remove parts of a document while releasing the remainder.
Example: The military will redact the document before releasing it, blacking out sections that are classified.
Edited or censored.
Example: The government released the redacted document, so most of it was blacked out as secret.
