service pack (n)~ A tested cumulative set of all hotfixes security updates critical updates and updates as well as additional fixes for problems found internally since the release of the product. Service packs may also contain a limited number of customer requested design changes or features and contain all fixes since the previous service pack or RTM. service package (n)~ A package also known as a service template is a file that contains the role binaries and the service definition file to be published to the Microsoft Azure fabric.