A spoiler is a piece of information that reveals essential plot elements and twists of a certain narrative to a person who has not read (or not finished reading) the narrative in question.
The word "spoiler" is derived from the fact that foreknowledge of key plot elements in a narrative may ruin or spoil a reader's enjoyment of that narrative. This is particularly true in the case of narratives based on mystery or suspense, or those featuring a surprise ending.
This website, Dune Wiki, contains numerous spoilers regarding the Dune universe on virtually every article. Readers who believe that spoilers would diminish their enjoyment of the Dune universe are advised not to read our articles before going through the novels, movies or games that they wish to experience without spoilers.