These are a solution to how to install applications
dependent on a host of factors, such as language
libraries, database instances, environment variables
and configurations, operating system versions, and so
on.
Software as a Service:
Amazon Web Services
"SaaS has become a common delivery model for many
business applications, including office and messaging
software, payroll processing software, DBMS software,
management software, CAD software, development
software, gamification, virtualization, accounting,
collaboration, customer relationship management (CRM),
management information systems (MIS), enterprise
resource planning (ERP), invoicing, human resource
management (HRM), talent acquisition, content
management (CM), and service desk management. SaaS
has been incorporated into the strategy of nearly all
leading enterprise software companies."
Wikipedia
