Which software distribution model hosts applications and makes them available over the internet?

• A. Software as a Service (SaaS)
• B. IaaS
• C. PaaS
• D. Cloud Concepts

Answer: (A)

Software as a Service is the model where applications are hosted by a provider and delivered over the internet. You access the program through a web browser or lightweight client, without installing or maintaining the software locally. Updates, security, and scalability are handled by the provider, and pricing is typically subscription-based.

IaaS focuses on providing virtualized computing resources (servers, storage, networking) you manage yourself, not ready-to-use applications. PaaS offers a development and runtime environment for building and deploying apps, but you’re supplying and managing the applications themselves. Cloud Concepts is a general term rather than a specific service delivery model.