Infrastructure as a service (IaaS) is a cloud model that provides on-demand access to cloud-hosted physical and virtual servers, storage, and networking resources. IaaS customers can provision, configure, and use these resources as they would use on-premises hardware, but without the hassle of purchasing, installing, managing, and maintaining them. The cloud service provider owns, manages, and maintains the hardware and computing resources in its own data centers, and charges the customers based on their usage. IaaS is suitable for customers who need flexibility, scalability, and control over their IT infrastructure, and who want to avoid the high costs and complexity of owning and operating their own hardware. The other options are not correct because:

Software as a service (SaaS) is a cloud model that provides on-demand access to ready-to-use, cloud-hosted application software. SaaS customers do not need to install, update, or maintain the software, as the cloud service provider handles all the technical aspects. SaaS is suitable for customers who need to access common applications, such as email, office productivity, or customer relationship management, without worrying about the underlying infrastructure or platform.

Data as a service (DaaS) is a cloud model that provides on-demand access to cloud-hosted data sources, such as databases, data warehouses, or data lakes. DaaS customers can query, analyze, and visualize the data, as well as integrate it with other applications or services, using APIs or web interfaces. DaaS is suitable for customers who need to leverage data from various sources, such as social media, IoT devices, or third-party providers, without having to store, manage, or process the data themselves.

Platform as a service (PaaS) is a cloud model that provides on-demand access to a complete, ready-to-use, cloud-hosted platform for developing, running, maintaining, and managing applications. PaaS customers can use the platform’s tools, frameworks, libraries, and services to create and deploy applications, without having to worry about the underlying infrastructure or software. PaaS is suitable for customers who need to develop, test, and deploy applications quickly and efficiently, and who want to take advantage of the cloud’s scalability, reliability, and security features. References = IaaS vs. PaaS vs. SaaS; AWS Fundamentals: Understanding Compute, Storage, Database, Networking & Security; What are the different types of cloud computing?; What is Cloud Storage and How to Use It