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Cloud Service Models (CSM): IaaS, PaaS and SaaS Explained

Cloud Service Models (CSM) explain how cloud computing services are delivered to users and how responsibilities are shared between cloud providers and users. This presentation provides a clear, structured, and comprehensive overview of the three major cloud service models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). It covers their definitions, key features, responsibilities, advantages, examples, use cases, and major differences. The presentation also explains how IaaS, PaaS, and SaaS differ in terms of user control, management, scalability, flexibility, and practical applications, providing a clear understanding of their role in modern cloud computing.

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CLOUD SERVICE MODELS(CSM) PRITHYADARSHAN T Department of CSE(AI&ML) SARANATHAN COLLEGE OF ENGINEERING, TIRUCHIRAPPALLI-12
What is Cloud Computing? o Cloud computing is the delivery of computing resources and services over the Internet instead of relying only on local computers or physical infrastructure. o Common Cloud Resources o Computing Power – Processing resources for applications o Storage – Storing files and data o Databases – Managing structured data o Networking – Connecting systems and services o Software – Applications delivered through the cloud o Development Platforms – Tools for application development o Security Services – Protection of data and resources
What are Cloud Service Models? Cloud Service Models (CSM) define the type of service provided by the cloud provider and the responsibilities handled by the user. Three Major Cloud Service Models 1. IaaS – Infrastructure as a Service Provides virtualized servers, storage, and networking. 2. PaaS – Platform as a Service Provides a development and deployment platform for building applications. 3. SaaS – Software as a Service Provides ready-to-use software applications over the Internet.
IaaS: Infrastructure as a Service Definition oInfrastructure as a Service (IaaS) provides virtualized computing infrastructure such as servers, storage, networking, and virtual machines through the Internet. oInstead of purchasing physical hardware, organizations can rent infrastructure from a cloud provider. Simple Example +Instead of buying a physical server for a website, a company can rent a virtual server from a cloud provider and use it whenever required.
Key Components of IaaS oVirtual Machines oVirtual Storage oNetworking oFirewalls oLoad Balancers oOperating Systems
IaaS: Responsibilities and Features Responsibility Model Cloud Provider manages: o Physical servers o Data centers o Networking hardware o Storage hardware o Virtualization User manages: o Operating system o Applications o Data o Runtime environment o Security configurations
IaaS: Advantages & Key Features Key Features o High flexibility and control o On-demand resource provisioning o Scalable infrastructure o Pay-as-you-go pricing o Virtualized resources o Internet-based access Advantages o Reduces hardware investment o Provides complete control over virtual infrastructure o Resources can be increased or decreased easily o Suitable for large and changing workloads
IaaS: Examples and Use Cases Examples Amazon EC2 Microsoft Azure Virtual Machines Google Compute Engine Use Cases 1. Website Hosting Hosts websites and web applications on virtual servers. 2. Development and Testing Developers can create temporary virtual environments for testing. 3. Data Backup and Recovery Organizations can store backups in cloud infrastructure. 4. Big Data Processing Provides scalable computing resources for processing large datasets. 5. Enterprise Applications Companies can run business applications without owning physical servers.
PaaS: Platform as a Service Definition Platform as a Service (PaaS) provides a complete development and deployment platform that allows developers to build, test, deploy, and manage applications without managing the underlying infrastructure. What does PaaS provide? o Operating system o Runtime environment o Development tools o Databases o Middleware o Application hosting o Deployment tools
Purpose & Example of PaaS Main Purpose PaaS allows developers to focus on application development instead of server and infrastructure management. Simple Example A developer wants to create a web application. With PaaS, the developer can upload the application code, while the platform handles the servers, operating system, runtime and scaling.
Responsibilities of PaaS Cloud Provider Manages o Physical infrastructure o Virtualization o Operating system o Runtime environment o Middleware o Servers o Storage Developer/User Manages o Application code o Application configuration o Data
Key Features & Advantages of PaaS Key Features o Faster application development o Built-in development tools o Automated deployment o Scalability o Database integration o Application monitoring o Collaboration support Advantages o Reduces infrastructure management o Speeds up development o Simplifies application deployment o Supports automatic scaling o Reduces development costs
PaaS: Examples and Use Cases Examples Google App Engine Microsoft Azure App Service Heroku Use Cases 1. Web Application Development Develop and deploy web applications quickly. 2. Mobile Application Development Provides backend services and development environments. 3. API Development Developers can create and deploy APIs without managing servers. 4. Software Testing Applications can be tested in managed cloud environments. 5. Rapid Application Development Useful when applications need to be developed and deployed quickly.
SaaS: Software as a Service Definition o Software as a Service (SaaS) delivers fully functional software applications over the Internet. o Users can access the software through a web browser or application without installing and maintaining the underlying infrastructure. How SaaS Works o Cloud Provider Hosts & Manages Software User accesses → → through Internet Key Features o Browser-based access o Subscription-based model o Automatic software updates o Centralized data management o No installation required o Provider manages the complete service
SaaS: Responsibilities and Advantages Cloud Provider Manages Everything o Servers o Storage o Networking o Operating system o Runtime o Application o Updates o Maintenance o Security infrastructure
User Mainly Manages oUser settings oAccount access oData entered into the application oAccess permissions Advantages oEasy to access from anywhere oNo software installation required oAutomatic updates oLow maintenance oSubscription-based pricing oEasy collaboration
SaaS: Examples and Use Cases Examples o Google Workspace o Microsoft 365 o Salesforce o Dropbox o Zoom Use Cases o 1. Online Collaboration Teams can create, edit and share documents online. o 2. Customer Relationship Management Businesses can manage customers, sales and support activities.
o3. Communication Applications support online meetings, messaging and communication. o4. File Storage and Sharing Users can store and access files through the Internet. o5. Business Applications Organizations can use accounting, HR and productivity applications without installing them locally.
Comparison of IaaS, PaaS and SaaS Feature IaaS PaaS SaaS Full Form Infrastructure as a Service Platform as a Service Software as a Service Provides Infrastructure Development Platform Complete Software User Control High Medium Low User Manages OS, Apps, Data Apps, Data Mainly Data & Settings Provider Manages Hardware & Virtualization Infrastructure + Platform Almost Everything Main Users System Administrators Developers End Users Flexibility Very High High Limited Maintenance More user responsibility Shared Provider responsibility Example Amazon EC2 Google App Engine(GAE) Google Workspace Main Purpose Infrastructure Application Software Usage
Cloud Service Model Hierarchy Traditional IT Applications ↓ Data ↓ Runtime ↓ Operating System ↓ Virtualization ↓ Servers & Storage ↓ Networking
IaaS oCloud provider manages hardware + virtualization. oUser manages OS + runtime + applications + data. PaaS oCloud provider manages infrastructure + OS + runtime + development platform. oUser mainly manages applications + data. SaaS oCloud provider manages almost the entire stack. oUser simply uses the application.
Advantages of Cloud Service Models 1. Anywhere Access o Cloud services can generally be accessed from different locations through the Internet, subject to authentication and connectivity. 2. Cost Reduction o Organizations can reduce spending on: o Hardware o Data centers o Maintenance o Infrastructure management 3. Scalability o Resources can be increased or decreased according to workload requirements.
4. Automatic Updates o Many cloud services provide automatic software, security and infrastructure updates. 5. Faster Deployment o Applications and services can be deployed faster than traditional infrastructure setups. 6. Resource Optimization o Organizations pay for resources according to their usage or selected service plan.
Disadvantages/Limitations of Cloud Service Models 1. Internet Dependency o Most cloud services require a reliable Internet connection. 2. Security and Privacy Risks o Sensitive data stored in cloud environments must be protected using appropriate security controls. 3. Vendor Lock-in o Moving applications and data from one cloud provider to another may sometimes be difficult or costly. 4. Service Downtime o Cloud services may become temporarily unavailable because of outages or maintenance.
5. Limited Control o In PaaS and SaaS, users have less control over the underlying infrastructure. 6. Subscription Costs o Long-term usage of cloud services can become expensive depending on the pricing model and resource consumption. 7. Plan-Based Limitations o Storage, features, computing power and other resources may depend on the selected service plan.
Real-World Example oSuppose a company wants to build an online shopping application. Using IaaS oThe company: oRents virtual machines oInstalls an operating system oConfigures the server oInstalls databases and software oDeploys the application
Using PaaS oThe company: oDevelops the application oUploads the code oUses the platform's database and deployment services Less infrastructure management Faster development → Using SaaS oThe company: oUses an already-developed application oLogs in through a browser oConfigures settings oUses available features Ready-to-use Minimal management →
Choosing the Right Service Model Choose IaaS when: oYou need high control over infrastructure. oYou need customized operating systems. oYou have an IT team to manage servers. oWorkloads require flexible infrastructure. Choose PaaS when: oYou are primarily developing applications. oYou want faster deployment. oYou do not want to manage servers and operating systems.
oYou need integrated development tools. Choose SaaS when: oYou need ready-to-use software. oYou want minimum maintenance. oYou want quick deployment. oUsers need access through the Internet.
Conclusion Key Takeaways o Cloud Service Models define how cloud resources and services are delivered to users. o IaaS provides virtualized infrastructure. o PaaS provides a managed platform for application development. o SaaS provides complete software applications over the Internet. o As we move from IaaS PaaS SaaS → → , user responsibility decreases while provider responsibility increases. o Organizations choose a service model based on their control, flexibility, cost, development and maintenance requirements.
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