This category is used for administration of the Wikipedia project, and is not part of the encyclopedia. It contains pages which are not articles, or lists articles by status, rather than content.
This category contains articles which need to be split into multiple articles. This is usually done when an article is becoming too long or covers too broad a subject. See Wikipedia:Summary style for guidelines on how to do this, and Wikipedia:Disambiguation for guidelines on creating "disambiguation" pages to distinguish similarly-named articles.