The capability provided to the consumer is to use the provider’ss applications running on a cloud infrastructure. A SaaS application isn’t owned by the organization that is using it, there isn’t much flexibility in changing the application to support a particular integration approach.
Software-as-a-Service (SaaS) applications in the cloud are made accessible via a network to the SaaS consumers and are accessible from various client devices through a thin client interface such as a web browser (e.g., web-based email). The consumer does not manage or control the underlying cloud infrastructure including network, servers, operating systems, storage, or even individual application capabilities, with the possible exception of limited user-specific application configuration settings. The consumers of SaaS can be organizations that provide their members with access to software applications, end users who directly use software applications, or software application administrators who configure applications for end users.
SaaS consumers can be billed based on the number of end users, the time of use, the network bandwidth consumed, the amount of data stored or duration of stored data.