1. IAAS: Infrastructure As A Service (IAAS) is means of delivering computing infrastructure as on-demand services. It is one of the three fundamental cloud service models. The user purchases servers, software data center space, or network equipment and rent those resources through a fully outsourced, on-demand service model. It allows dynamic scaling and the resources are distributed as a service. It generally includes multiple-user on a single piece of hardware.
It totally depends upon the customer to choose its resources wisely and as per need. Also, it provides billing management too.
2. PAAS: Platform As A Service (PAAS) is a cloud delivery model for applications composed of services managed by a third party. It provides elastic scaling of your application which allows developers to build applications and services over the internet and the deployment models include public, private and hybrid.
Basically, it is a service where a third-party provider provides both software and hardware tools to the cloud computing. The tools which are provided are used by developers. PAAS is also known as Application PAAS. It helps us to organize and maintain useful applications and services. It has a well-equipped management system and is less expensive compared to IAAS.
3. SAAS: Software As A Service (SAAS) allows users to run existing online applications and it is a model software that is deployed as a hosting service and is accessed over Output Rephrased/Re-written Text the internet or software delivery model during which software and its associated data are hosted centrally and accessed using their client, usually an online browser over the web. SAAS services are used for the development and deployment of modern applications.
It allows software and its functions to be accessed from anywhere with good internet connection device and a browser. An application is hosted centrally and also provides access to multiple users across various locations via the internet.
Difference between IAAS, PAAS and SAAS :
| Basis Of | IAAS | PAAS | SAAS |
|---|---|---|---|
| Stands for | Infrastructure as a service. | Platform as a service. | Software as a service. |
| Uses | IAAS is used by network architects. | PAAS is used by developers. | SAAS is used by the end user. |
| Access | IAAS gives access to the resources like virtual machines and virtual storage. | PAAS gives access to run time environment to deployment and development tools for application. | SAAS gives access to the end user. |
| Model | It is a service model that provides virtualized computing resources over the internet. | It is a cloud computing model that delivers tools that are used for the development of applications. | It is a service model in cloud computing that hosts software to make it available to clients. |
| Technical understanding. | It requires technical knowledge. | Some knowledge is required for the basic setup. | There is no requirement about technicalities company handles everything. |
| Popularity | It is popular among developers and researchers. | It is popular among developers who focus on the development of apps and scripts. | It is popular among consumers and companies, such as file sharing, email, and networking. |
| Percentage rise | It has around a 12% increment. | It has around 32% increment. | It has about a 27 % rise in the cloud computing model. |
| Usage | Used by the skilled developer to develop unique applications. | Used by mid-level developers to build applications. | Used among the users of entertainment. |
| Cloud services. | Amazon Web Services, sun, vCloud Express. | Facebook, and Google search engine. | MS Office web, Facebook and Google Apps. |
| Enterprise services. | AWS virtual private cloud. | Microsoft Azure. | IBM cloud analysis. |
| Outsourced cloud services. | Salesforce | Force.com, Gigaspaces. | AWS, Terremark |
| User Controls | Operating System, Runtime, Middleware, and Application data | Data of the application | Nothing |
| Others | It is highly scalable and flexible. | It is highly scalable to suit the different businesses according to resources. | It is highly scalable to suit the small, mid and enterprise level business |
Advantages of IaaS
- The resources can be deployed by the provider to a customer’s environment at any given time.
- Its ability to offer the users to scale the business based on their requirements.
- The provider has various options when deploying resources including virtual machines, applications, storage, and networks.
- It has the potential to handle an immense number of users.
- It is easy to expand and saves a lot of money. Companies can afford the huge costs associated with the implementation of advanced technologies.
- Cloud provides the architecture.
- Enhanced scalability and quite flexible.
- Dynamic workloads are supported.
Disadvantages of IaaS
- Security issues are there.
- Service and Network delays are quite a issue in IaaS.
Advantages of PaaS –
- Programmers need not worry about what specific database or language the application has been programmed in.
- It offers developers the to build applications without the overhead of the underlying operating system or infrastructure.
- Provides the freedom to developers to focus on the application’s design while the platform takes care of the language and the database.
- It is flexible and portable.
- It is quite affordable.
- It manages application development phases in the cloud very efficiently.
Disadvantages of PaaS
- Data is not secure and is at big risk.
- As data is stored both in local storage and cloud, there are high chances of data mismatch while integrating the data.
Advantages of SaaS
- It is a cloud computing service category providing a wide range of hosted capabilities and services. These can be used to build and deploy web-based software applications.
- It provides a lower cost of ownership than on-premises software. The reason is it does not require the purchase or installation of hardware or licenses.
- It can be easily accessed through a browser along a thin client.
- No cost is required for initial setup.
- Low maintenance costs.
- Installation time is less, so time is managed properly.
Disadvantages of SaaS
- Low performance.
- It has limited customization options.
- It has security and data concerns.
