Software as a service (SaaS) is a model of software delivery where the software company provides maintenance, daily technical operation, and support for the software provided to their client. It assumes the software is delivered over the internet. Software can be delivered using this method to any market segment including home consumers, small business, medium and large business.
The key characteristics of SaaS software, according to IDC, include:
- activities that are managed from central locations rather than at each customer's site, enabling customers to access applications remotely via the Web
- network-based access to, and management of, commercially available (i.e., not custom) software
- application delivery that typically is closer to a one-to-manymodel (single instance, multi-tenant architecture) than to a one-to-onemodel.
SaaS is conceptually similar to the original mainframe computing model in which control was centralized, user privacy was minimal and the flexibility allowed to the individual user was limited. Many consumers may feel that in SaaS the gradual erosion of their privacy and control has reached an unacceptable limit.
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