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## (Text) Processor
### Goals
### History
### How
### Extra
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# (Text/Document) Processor
A document processor is a piece of software that interprets text and transcode its content from one form to another. There are many types of processors, yet for the purpose of this lesson we focus on only two types: (1) __Interpreter__ and (2) __Converter__. An interpreter is very similar to your web browser: it gets as input an html file (and related scripts), interprets their syntax and content and display the results on the screen. More generally, an interpreter first parses the content of an input file, then creates its own representation of it and finally performs the commands it has interpreted. In the process, there is a translation stage where the input syntax and content is read (parsed) and transformed into a transitional or median representation. This median representation is then linked to specific commands that are in turn executed locally on the interpreters machine. In the case of the converter, such median representation get transcoded into a specified format with a specific syntax written in a file. For example, an HTML file can be converted into both a PDF _and/or_ a DOC file. Interpreters and converters are ubiquitous systems which are fundamental for both publishing and archiving practices.