What does SaaS stand for?
SaaS stands for Software as a Service. Software as a service: complete applications delivered over the internet. The provider runs the stack; the customer still manages data, identities and access.
SaaS is the cloud model in which the provider runs a complete application and customers use it, normally through a browser. The provider looks after the servers, the operating systems, the application and its updates. The customer manages only users, settings and the data they put in. Web-based email, office suites, customer relationship systems and accounting services are typical examples. The customer is still responsible for who has access and for what is stored there.
SaaS in practice: an example
A ten-person company moves from a mail server in a cupboard to a hosted email service. There is no longer a server to patch or back up. The owner still has to remove accounts when staff leave and switch on multifactor authentication, because the provider cannot decide who belongs in the company.
What SaaS is confused with
SaaS vs PaaS: what is the difference?
With SaaS you use a finished application. With PaaS you get a platform on which you deploy an application you wrote yourself. What PaaS stands for
SaaS vs IaaS: what is the difference?
With SaaS the provider manages everything up to the application. With IaaS the provider stops at the virtual hardware and the customer installs and maintains the operating system and everything above it. What IaaS stands for
Which exams cover SaaS?
SaaS is on the official CompTIA acronym list for three of the four exams covered here.
- Security+ SY0-801: 2.3 (Threats, Vulnerabilities, and Attacks).
- Network+ N10-009: 1.0 (Networking Concepts).
- A+ 220-1201 and 220-1202: 220-1201 4.0 (Virtualization and Cloud Computing).
Each number is a CompTIA exam objective and the name in brackets is its domain. The exam puts the term in a scenario; it does not ask you to recite the expansion.
Check yourself: two practice questions
Written by CertSprint for this page. They are not taken from any exam.
1. A company subscribes to a web-based accounting application and has nothing to install or patch. Which cloud service model is this?
- IaaS
- PaaS
- SaaS
- On-premises hosting
Show the answer
C. SaaS. A finished application delivered over the internet, with the provider managing everything beneath it, is software as a service.
2. In a SaaS model, which task remains the customer's responsibility?
- Patching the provider's servers
- Managing user accounts and access to the data
- Replacing failed disks in the data centre
- Updating the application code
Show the answer
B. Managing user accounts and access to the data. The provider runs the infrastructure and the application. Deciding who may sign in and what they may see stays with the customer.
Sources: NIST SP 800-145, The NIST Definition of Cloud Computing; NIST glossary: Software as a Service. The acronym and its expansion come from CompTIA's official acronym lists, linked from each exam glossary above. The explanation, example and questions are CertSprint's own, checked against these sources on 11 November 2026.