SaaS provides a complete software solution that you purchase on a pay-as-you-go basis from a cloud service provider. You rent the use of an app and resources for your organisation, and your users connect to it over the Internet, usually with a web browser or possibly a phone app. All of the underlying infrastructure, middleware, app software and app data are located in the service provider’s data centre. The service provider manages the hardware and software, and with the appropriate service agreement, will ensure the availability and the security of the app, and your data. SaaS allows your organisation to get quickly up and running with an app at minimal upfront cost.