Packages
You use Joomla Packages when you want to bundle together a number of Joomla extensions of different types.
The single operation of installing the package results in the installation of each of the constituent extensions.
To define a package you have
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a top level folder with the manifest file for the package
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subfolders for the package constituents, each extension with its own manifest file, etc.
See Installating Extensions - Package for details of the package manifest file and how to organise the constituents of the package.