Package (UML)

A package in the Unified Modeling Language is used "to group elements, and to provide a namespace for the grouped elements".^[1] A package may contain other packages, thus providing for a hierarchical organization of packages.

Pretty much all UML elements can be grouped into packages. Thus, classes, objects, use cases, components, nodes, node instances etc. can all be organized as packages, thus enabling a manageable organization of the myriad elements that a real-world UML model entails.