Trademark A program produced by Adobe Systems Inc. for the production and manipulation of portable document format (PDF) files. Adobe Reader is a utility for reading, displaying, and printing PDF files, and is available free. Most personal computers have a version of Adobe Reader and most browsers now allow download and display of a PDF file using Reader plugins. The full version of Acrobat (which is not free) provides a number of other features. It was originally called Acrobat Exchange (up to version 3) and includes a number of other features, in particular Acrobat Distiller (a program for converting PostScript files into PDF files). The program also has facilities for combining, splitting, or rearranging documents, adding bookmarks, notes, etc.