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Software as a service (SaaS / s æ s / [1]) is a cloud computing service model where the provider offers use of application software to a client and manages all needed physical and software resources. [2] Unlike other software delivery models, it separates "the possession and ownership of software from its use". [3]
SaaS licenses are usually temporary and charged on a pay-per-usage or subscription basis, [17] although other revenue models such as freemium are also used. [18] For customers, the advantages of temporary licenses include reduced upfront cost, increased flexibility, and lower overall cost compared to a perpetual license. [14]
Software industry business models include SaaS (subscription-based), PaaS (platform services), IaaS (infrastructure services), and freemium (free with premium features). Others are perpetual licenses (one-time fee), ad-supported (free with ads), open source (free with paid support), pay-per-use (usage-based), and consulting/customization services.
SaaS licenses are usually temporary and charged on a pay-per-usage or subscription basis, [32] although other revenue models such as freemium are also used. [33] Even if the user purchases a perpetual license, it is common for EULAs to allow unilateral termination by the vendor for any number of vague reasons or none at all.
In order to retain access to journals that were released during the term of a license for digital electronic journals, the library must obtain perpetual access rights. [4] The ability to maintain perpetual access can be seen in the shift from print to electronic material, as apparent in both user demand and advantages of non-print material.
According to The NIST Definition of Cloud Computing, [3] there are three service models associated with cloud computing: infrastructure as a service (IaaS), platform as a service (PaaS), and software as a service (SaaS). The concept of ITaaS as an operating model is not limited to or dependent on cloud computing.
It took outcry from affected communities, medical professionals, and activists before the U.S. and international health community took major action to combat the growing epidemic.
Perpetual access or perpetual license, a license that allows continued access to electronic material (e.g. software) Perpetual Entertainment, an American software development company; Perpetual Maritime Truce, the treaty defining peaceful relations in the Trucial States, today the United Arab Emirates. Perpetual motion (disambiguation)