<P> Adobe also allows third parties to develop Acrobat plug - ins, which can add extra functions to the Acrobat program . </P> <P> Adobe has changed the names of the products of the Acrobat set several times, also dividing, merging, or discontinuing products . Initially, the name "Acrobat" was used as the parent name of a set of products which included Acrobat Reader, Acrobat Exchange and Acrobat Distiller . Over time, Acrobat Reader became Reader; and the name Acrobat Exchange was simplified to Acrobat . Between versions 3 and 5, Standard and Professional versions were one product known simply as Acrobat . </P> <P> In April 2015, Adobe introduced the Adobe "Document Cloud," along with the first of several applications with "DC" at the end of the name . One of the main goals was to have all of a user's PDFs available on any of the user's devices, such as editing a PDF on an iPad and then later retrieving it on a PC . As of October, 2015, the "Document Cloud" also includes integration with Dropbox and includes electronic signature improvements, although at least some features require a subscription . </P> <P> As of April 2015, the main members of the Acrobat family include: </P>

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