Does not allow highlighting or bookmarking. Allows printing, searching, cutting and pasting of text. Allows links to external web pages. Graphics and text are kept in separate files, which makes saving file on home computer for later viewing difficult. Does not allow for secure distribution of material, which discourages its widespread use for copyrighted works.
Graphics display well.
Useful for citing pages in a research report. Also allows printing, searching, and cutting and pasting of text. Free reader does not allow highlighting and bookmarking of pages. Large file size and inefficient use of screen real estate due to orginal page size reduces functionality. Searching, highlighting, bookmarking, annotations, and a custom dictionary increase usability.