Blog » Software as a service
Software as a service (SaaS /sæs/) is a software licensing and delivery model
in which software is licensed on a subscription basis and is centrally hosted. It is sometimes
referred to as "on-demand software", and was formerly referred to as "software plus
services" by Microsoft. SaaS applications are also known as on-demand software and
Web-based/Web-hosted software.
SaaS is considered to be part of cloud computing, along with infrastructure as a service (IaaS),
platform as a service (PaaS), desktop as a service (DaaS), managed software as a service (MSaaS),
mobile backend as a service (MBaaS), datacenter as a service (DCaaS), and information technology
management as a service (ITMaaS).
SaaS apps are typically accessed by users using a thin client, e.g. via a web browser. SaaS has become
a common delivery model for many business applications, including office software, 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, field service
management, human resource management (HRM), talent acquisition, learning management systems, content
management (CM), geographic information systems (GIS), and service desk management.
SaaS has been incorporated into the strategy of nearly all leading enterprise
software companies. Gartner forecasts that Software as a service (SaaS) remains the largest market
segment on public cloud services and is forecast to reach $122.6 billion in 2021.