Software as a Service (SaaS) is a type of cloud computing that delivers a single application through the browser to many, (potentially thousands or tens of thousands) of customers using a multitenant architecture. On the customer side, it means no upfront investment in servers or software licensing; on the provider side, with just one app to maintain; costs are low compared to conventional hosting. APIs are also increasingly available in the cloud; they enable developers to exploit functionality of others over the Internet, rather than developing, hosting, and delivering it themselves,
Table shows some cloud service providers and the services that they offer:
These providers range from those offering discrete services made to interface seamlessly with your applications—such as Strike Iron, Xignite (a provider of on-demand financial market data), Google Maps, and Google Voice—to the full development platform offered by Salesforce.com’s Force.com and the range of APIs offered by Yahoo BOSS, Google, Bloomberg LP, and even the U.S. Postal Service.
Many online banking and conventional credit card processing services are also headed in this direction. SaaS is now solidly coming into its own and is now increasingly being renamed “On Demand” software, which is certainly more euphonious.
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