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This cloud computing service is an advanced version of IaaS. Apart from just providing the IT infrastructure, PaaS also provides the computing platform and solution stack as a service. PaaS is a cloud computing service that provides developers with a framework that can be used for building custom applications. Platform as a Service lets software developers build custom applications online without having to worry about data storage, data serving, and management.

A typical Platform as a Service offering consists of:

• Hosting Solutions 
• OS 
• Software tools for design and development.  
• Environment for server-side scripting 
• DBMS 
• Network Access 
• Storage 
• Server Software 
• Support 

Features and benefits of PaaS cloud computing services 

• PaaS makes software development easy even for non-experts as anybody can develop an application through the web browser with just a single click functionality.
• There is no need for the users to upgrade or update the infrastructure as the PaaS service provider handles all the update patches, upgrades, and regular software maintenance.
• PaaS provides location independence as developers in different locations can work together on the same application build.  
• There is no need to invest in physical infrastructure or in expertise required to manage it, an example of this would be SAP. The ability to rent virtual IT infrastructure brings in great cost benefits for the users. 

Before we understand Functions as a Service, it is important to understand the most popular tech term associated with FaaS – serverless computing. Serverless computing is a cloud computing model that takes away low-level infrastructure decisions and server management from the developers. The application architect need not deal with the allocation of resources as it is managed by the cloud service provider. 

FaaS is a brand-new and very young cloud computing service acting as a game-changer for many businesses. It is a serverless computing concept that lets software developers develop applications and deploy an individual “function”, piece of business logic, or an action without maintaining a server. It increases the efficiency as developers need not to consider server operations because they are hosted externally. 

Examples of FaaS include Google Cloud Function, Microsoft Azure Functions, Webtask.io, Iron.io , Open Whisk, and AWS Lambda.

Features and benefits of FaaS cloud computing services 

• Money is never wasted on inactive resources as users are billed depending on the amount of functionality used. 
• Makes developers efficient as they can focus more on writing application-specific logic rather than having to deal with the server logistics. 
• FaaS code is inherently scalable and fault-tolerant.

A special cloud computing service that incorporates both IaaS and PaaS service offerings. SaaS is a cloud computing service that provides application-level services tailored to diverse business needs such as business analytics, CRM, or marketing automation. SaaS is a cloud computing service offering that provides web-based software applications to customers on-demand. SaaS providers host a fully-functional application through a browser-based interface and make it accessible to the users through the Internet. SaaS offerings allows the cloud to be leveraged for software architecture thereby reducing the overhead of support, maintenance, and operations as the applications run on systems belonging to the vendor. SaaS is the most familiar cloud computing service offering as users most often interact directly with SaaS applications like Netflix, Gmail, JIRA, Dropbox, or Salesforce.  SaaS is a subscription-based offering where users subscribe to software on a monthly basis instead if purchasing it so there are no upfront costs involved. It also provides a provision to the users to end the subscription when it is no longer needed.
Examples of SaaS Cloud Computing Services:SAP Business ByDesign, Zoho CRM, AppDynamics, Microsoft Office 365, Pardot Marketing Automation.
Features and benefits of SaaS cloud computing services 

• There is no initial setup cost as the users can make use of the application as soon as they subscribe. There is no hardware cost as well because the processing power is supplied by the service provider. 
• Flexible payments as the users pay for the services on a pay-as-you-go model. 
• Any updates to the software are automatic and free of charge. 
• SaaS provides cross-device compatibility because SaaS applications can be accessed through any internet enabled devices, such as laptop, smartphone, or desktop. 
• Enterprises need not engage an IT expert to download the software on multiple systems in the office nor have to worry about the keeping the software up-to-date on every PC.

The lower end of managed cloud computing services where hardware resources are provided by an external provider and managed for you. IaaS provides users access to computing resources such as networking, processing power and data storage capacity.   IaaS helps users to use computing power or virtual machines without labor-intensive hardware investments or server management. Physically, the hardware resources are pulled from a variety of networks and servers distributed across different data centers, all of which are managed and maintained by the cloud service provider. For example, say a user wants a Linux system, with IaaS he will get access to it without having to worry about the networking of the machine on which Linux is installed or the physical system. IaaS is beneficial for customers who want to create cost-effective and highly scalable IT solutions where the expenses and complexities involved in managing hardware resources are outsourced to a service provider. Most of the IaaS packages include servers, networking, storage, and virtualization components while the users are responsible for installing and maintaining databases, OS, applications, and security components. 
Examples of IaaS Cloud Computing Services:Amazon EC2, Windows Azure, Rackspace, Google Compute Engine.
Features and benefits of IaaS cloud computing services 

• A typical infrastructure as a service offering saves both time and money as the underlying hardware set up and support is provided by the service provider.
• Resources are available on demand as and when required so there is no wastage of any unused resources and no delays on adding any resources.
• Utility-based pricing model i.e. pay only for the resources you actually use.