Module

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A Module is a separate, interchangeable, self contained component that represents a unit of functionality. It is best to define a Module what it does:

It encapsulates code and data into a single unit (usually a file) that implements a specific functionalityIt provides an interface as a contract between the users of the module (i.e., clients) to access the functionality in an consistent wayIt allows for the functionality to be plug-able into other modules (i.e., clients) that use the interfaceIt is packaged in a single unit so that it can be easily deployed. Generally it is stored as a file, but it could be an entry into a database (i.e., stored procedure), a datastream, etc.For example, dapper.net encapsulates database access. It has an api to access its functionality. It is a single file that can be plugged into a source tree.

Source: https://softwareengineering.stackexchange.com/questions/167859/what-actually-is-a-module-in-software-engineering