SaaS – Software as a Service （Network-hosted application）
DaaS – Data as a Service （Customer queries against provider’s database）
PaaS– Platform as a Service （Network-hosted software development platform）
IaaS – Infrastructure as a Service （Provider hosts customer VMs or provides network storage）
IPMaaS – Identity and Policy Management as a Service （Provider manages identity and/or access control policy for customer）
NaaS – Network as a Service （Provider offers virtualized networks， e.g. VPNs)
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