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Write a short note of Postscript.

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1.PostScript, developed in 1985, is a page description language used mainly for desktop publishing.

 2.It is a high-level language that can describe the contents of the page which can be accurately displayed on the output device like printer.

 3.The combination of technical merits and widespread availability made PostScript a language of choice for graphical output for printing applications.

 4.Prior to PostScript the graphics were interpreted by the computer and sent as a series of dots to the printer using a series of escape sequences.

 5.These printer control languages varied from printer to printer, requiring program authors to create numerous drivers.

 6.PostScript compatible applications transforms a document into a PostScript program whose execution will result in the original document. 

 7.When the PostScript program is interpreted, the interpreter converts these instructions into the dots needed to form the output.

 8.Since the document-program is the same regardless of its destination, it is called device-independent.

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