As I received this question a couple of times in the past here a short summary of the different update types used with SharePoint:
Service Pack
What is it: A service pack is a combination of previously released fixes, fixes which have only been released in context of the service pack and potentially new functionality added to the product.
What is included: new fixes, new functionality, all previously released fixes (older Service Packs, CUs, PUs)
Multilingual: No . You need separate...(read more)
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