package

A named grouping of classes and interfaces that provides a package namespace. Classes, interfaces and class members without an explicit public, protected or private access modifier {access!modifier} have package visibility. Public classes and interfaces may be imported into other packages via an import statement.

A group of types. Packages are declared with the package keyword.

A group of files that modify Windows features. Package types include service packs, security updates, language packs, and hotfixes. Examples of packages include LanguagePack, Windows Foundation, and FeaturePack.

A "namespace" for global variables, subroutines, and the like, such that they can be kept separate from like-named symbols in other namespaces. In a sense, only the package is global, since the symbols in the package's symbol table are only accessible from code compiled outside the package by naming the package. But in another sense, all package symbols are also globals--they're just well-organized globals.