Integration Server 10.3 | Integration Server Administrator's Guide | Managing Services | Running Services When Packages Are Loaded, Unloaded, or Replicated | What Is a Replication Service?
 
What Is a Replication Service?
A replication service is one that the server automatically executes when it prepares to release or archive a package. The service executes when the administrator clicks the Create Release link on the Packages > Publishing > Create and Delete Releases screen or the Archive icon archive package icon on the Packages > Management screen.
Replication services provide a way for a package to persist state or configuration information so that this is available when the package is activated on the remote server.