SSIS - Package
About
A package defines a workflow of tasks to be executed
You can execute each package independently, and you can also use the Execute Package task to run one package from another.
File Extension: dtsx
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Template
You can also create a package template.
Create a package that includes the elements you want to reuse.
Save the package to the DataTransformationItems folder (By default, C:\Program Files (x86)\Microsoft Visual Studio 10.0 \Common7\IDE\PrivateAssemblies\ProjectItems\DataTransformationProject)
Reuse the package by adding a new item to the project and select the package in the Add New Item dialog box.
Change the Name and ID properties of the new package to avoid naming conflicts.
Dynamic
A dynamic package is a just a normal package where:
because their values can be set dynamically at run time.