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Most generally a package is a box, or such, containing something (perhaps, a present).
In computing, package is a programming term. In the Perl or Java programming languages, and in the Unified Modeling Language, a package can contain objects. It is equivalent to a container in Visual Basic.
Thus this type of package is more like the plastic bag which contains the groceries, than the package delivered by the postman.
See Packages in Java
In computing, a package is a type of file format to package software installation material. See software package for more.