This paper presents an overview on the state of the art of semantics for abstract
argumentation, covering both some of the most influential literature proposals
and some general issues concerning semantics definition and evaluation. As to
the former point, the paper reviews Dung's original notions of
complete, grounded, preferred, and stable semantics, as well as subsequently
proposed notions like semi-stable, ideal, stage, and CF2 semantics, considering
both the extension-based and the labelling-based approaches with respect to
their definitions. As to the latter point, the paper presents an extensive set
of general properties for semantics evaluation and analyzes the notions of
argument justification and skepticism. The final part of the paper is focused on
the discussion of some relationships between semantics properties and
domain-specific requirements.