Definition: System of software or hardware in which more or less self-contained modules or parts are integrated or designed to work with each other in such a way that each module adds features or functions to the overall system. * Professional camera systems are highly modular: each module adds a specific function or capability to the camera. * Software such as Quark XPress and Adobe Photoshop are arguably modular in that extra functions can be added by inserting Xtensions or Filters or Actions into the programs.

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