OpenCart is an e-commerce cart application built with its own in-house framework that uses the Model View Controller (MVC) language pattern; thus each module in OpenCart also follows the MVCL patterns. The controller creates logic and gathers data from the model and passes it to display them in the view. The OpenCart modules have admin and catalog folders. The files in the admin folder help in controlling the settings of modules and the files in the catalog folder handle the presentation layer (frontend). Each module has its own files by which it gets modular, and changing one module's file does not affect other modules.