Chapter 8 of Discourse Syntax (Discourse Markers) deals with elements within discourse which do not belong to the core clause but are either placed at the sentence periphery or within it as insertions. The chapter shows that discourse markers mainly serve the needs of spoken, interactive discourse, and that they are placed in variable sentence positions and also occur as characteristic discourse marker sequences. Discussing the use of discourse markers in different text types, the chapter highlights that discourse markers have a bracketing and an interactive function in spoken discourse, but that there is also some text-linguistic variation, such as a use in scripted discourse or in online writing to mark a certain informality. The issue of syntactic variation is covered by a discussion of the positioning of the discourse marker then. The chapter also touches upon the development and use of “actually” as a discourse marker, the rise and grammaticalization of discourse markers as parentheticals, and their role in language proficiency.