Word processors have various functions that allow a person to revise text without retyping an entire document. As the text is entered or after it has been retrieved, sections ranging from words and sentences to paragraphs and pages can be moved, copied, deleted, altered, and added to while displayed. As word processors have become more sophisticated, such functions as word counting, spell checking, footnoting, and index generation have been added. In addition, a document's format—type size, line spacing, margins, page length, and the like—usually can be easily altered. To aid in these alterations, the text is displayed as it will appear when printed with indented paragraphs and lists, multiple columns, tables, etc; this is called a what-you-see-is-what-you-get (WYSIWYG) display.
Word processors are distinguished from text editors and desktop publishing systems. Text editors are designed for creating and editing computer programs. While they have features found in simple word processors, such as search and replace, that make the entry and editing of words and numbers easier, text editors provide only the most primitive facilities for text formatting and printing. Desktop publishers may include only simple word processing features but provide enhanced formatting functions, such as routines for merging text and graphics into complex page layouts.
Preparation of textual documents on computer. A word-processing system typically consists simply of a personal computer linked to a computer printer, but it may instead employ a terminal linked to a mainframe computer. Word processing differs from typewriter typing in numerous ways. Electronic text can be moved around at will; misspelled terms can be corrected throughout the document by means of a single command; spelling and grammar checkers can automatically alert the user to apparent errors of spelling, punctuation, and syntax; and the document's format, layout, and type fonts and sizes can be changed repeatedly until a satisfactory design is achieved. Since all editing ideally occurs on-screen, word processing can result in decreased paper usage and simplified editing. When the final draft is ready, the document can be printed out (in multiple copies if necessary), sent as an e-mail attachment, shared on a computer network, or simply stored as an electronic file.
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