An HR team uses Microsoft 365 for email, file storage, and collaboration. What type of cloud service is this?

Microsoft 365, providing email, file storage, and collaboration tools, is a prime example of Software as a Service (SaaS). With SaaS, the vendor manages all aspects of the application, including the underlying infrastructure, operating systems, and software. Users simply access and utilize the application over the internet without needing to worry about maintenance, updates, or infrastructure management. PaaS (Platform as a Service) provides a platform for developers to build, run, and manage applications without the complexity of building and maintaining the infrastructure. IaaS (Infrastructure as a Service) offers virtualized computing resources over the internet, giving users control over operating systems, applications, and middleware. FaaS (Function as a Service) is a serverless execution model where developers write and deploy small, single-purpose functions that run in response to events. Since the HR team is directly using a fully managed application, SaaS is the correct classification.