Cloud Computing is an example for the X-as-a-Service delivery model. It is said that cloud computing is improving business agility because of the ability to rapidly and inexpensively provision technological infrastructure resources on a pay-per-use basis. So customers are urged not to buy and own hardware and software for themselves but instead they should make use of cloud computing services that are offered by the cloud computing providers.

In essence, this delivery model defies the need of physical ownership of hardware and software. What is the point of owning hardware and software? The only thing you want to do with it is using it at the time you need it. So it looks like that physical ownership is based on the need to have control on the availability of the functions offered by the software and hardware. The cloud computing proposition of on-demand delivery on a pay-per-use basis more or less removes the necessity to possess hardware and software.

AaaS	Architecture as a Service
BaaS	Business as a Service
CaaS	Computing as a Service
DaaS	Data as a Service
DBaaS	Database as a Service
EaaS	Ethernet as a Service
FaaS	Frameworks as a Service
GaaS	Globalization / Governance as a Service
HaaS	Hardware as a Service
IMaaS	Informaton as a Service
IaaS	Infrastructure as a Service
IDaaS	Identity as a Service
LaaS	Lending as a Service
MaaS	Mashups as a Service
OaaS	Organization as a Service
PaaS	Platform as a Service
SaaS	Software as a Service
TaaS	Technology as a Service
VaaS	Voice as a Service