Cloud computing is a general term for anything that involves delivering hosted services over the Internet. These services are broadly divided into three categories: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS).
Cloud sourcing is an arrangement in which a company pays a third-party cloud hosting provider to deliver and support IT services that could be provided in-house.
Data residency is a concept that refers to the physical location of information, as well as the local regulations imposed on that information based on where it resides.
The European Cloud Computing Strategy (ECCS) is an initiative established by the European Commission to promote the adoption of cloud computing services.
Hybrid cloud is a cloud computing environment that uses a mix of on-premises, private cloud and third-party, public cloud services with orchestration between the two platforms.