What was censored in the book 1984?

In George Orwell's "1984," the censorship primarily revolves around the alteration of historical records and the manipulation of language to control thought. The Party rewrites history to ensure that its narrative remains unchallenged, erasing any evidence of dissent or failure. Additionally, the concept of "Newspeak" is introduced to limit the range of thought, as reducing language constrains the ability to articulate rebellious ideas. This systematic censorship serves to maintain the Party's absolute power and suppress individualism.