Centralized hosting of business applications dates back to the 1960s. Starting in that decade, IBM and other mainframe computer providers conducted a service bureau business, often referred to as time-sharing

Horizontal SaaS and vertical SaaS are different models of cloud computing services. Horizontal SaaS targets a broad variety of customers,

Although not all software-as-a-service applications share all the following traits, the characteristics below are common among many of them:
Configuration and customization
SaaS applications similarly support what is traditionally known as

Some limitations slow down the acceptance of SaaS and prohibit it from being used in some cases:
• Because data is stored on the vendor's servers, data security

The cloud (or SaaS) model has no physical need for indirect distribution because it is not distributed physically and is deployed almost instantaneously, thereby negating the need for traditional

Most SaaS providers offer a multi-tenant architecture. With this model, a single version of the application, with a single configuration (hardware, network, operating system),

Several important changes to the software market and technology landscape have facilitated the acceptance and growth of SaaS:
• The growing use of web-based user interfaces by applications, along with the proliferation of associated