One of the very first page makeup software programs, created by Aldus Corporation (and since bought by Adobe Systems, Inc.), that allows the assembly of disparate page elements—text, line art, halftones, etc.—in a single document. Designed originally to run on the Apple Macintosh computer, PageMaker is now available for a variety of computer platforms, in particular, IBM-compatible computers running Microsoft Windows. The development of PageMaker in the mid-1980s, coupled with the creation of the Apple Macintosh and the PostScript page description language, were instrumental in the invention of desktop publishing.