This article puts on the agenda one of the fundamental theoretical questions within the emerging field of website history: how can the object of historical study — the website — be delimited? Its focus is on the 'website' artefact as a medium and a text. After elaborating a definition of the website, as well as discussing how the website is distinct from other possible analytical web objects (the web as a whole, web sphere, webpage and textual web element), the article addresses the challenges of delimiting the archived website. Finally, it outlines some of the key issues in a general discussion of website history.