IaaS PaaS SaaS A Comparative Study

Software as a service (SaaS) allows users to connect to and use cloud-based apps over the Internet. Common examples are email, calendaring and office tools (such as Microsoft Office 365).

SaaS provides a complete software solution which you purchase on a pay-as-you-go basis from a cloud service provider. You rent the use of an app for your organisation and your users connect to it over the Internet, usually with a web browser. All of the underlying infrastructure, middleware, app software and app data are located in the service provider's data center. The service provider manages the hardware and software and with the appropriate service agreement, will ensure the availability and the security of the app and your data as well. SaaS allows your organisation to get quickly up and running with an app at minimal upfront cost.

SAAS Takeaways

Software-as-a-Service (SaaS) is a software licensing model, which allows access to software a subscription basis using external servers.
SaaS allows each user to access programs via the Internet, instead of having to install the software on the user's computer.
SaaS has many business applications, including file sharing, email, calendars, customer retention management, and human resources.
SaaS is easy to implement, easy to update and debug, and can be less expensive (or at least have lower up -front costs) since users pay for SaaS as they go instead of purchasing multiple software licenses for multiple computers.
Drawbacks to the adoption of SaaS center around data security, speed of delivery, and lack of control.

SAAS Applications

Email services
Auditing functions
Automating sign-up for products and services
Managing documents, including file sharing and document collaboration
Shared company calendars, which can be used for scheduling events
Customer relationship management (CRM) systems, which are essentially a database of client and prospect information. SaaS-based CRMs can be used to hold company contact information, business activity, products purchased as well as track leads.

Advantages of SaaS

Gain access to sophisticated applications. To provide SaaS apps to users, you don't need to purchase, install, update or maintain any hardware, middleware or software. SaaS makes even sophisticated enterprise applications, such as ERP and CRM, affordable for organisations that lack the resources to buy, deploy and manage the required infrastructure and software themselves.
Pay only for what you use. You also save money because the SaaS service automatically scales up and down according to the level of usage.
Use free client software. Users can run most SaaS apps directly from their web browser without needing to download and install any software, although some apps require plugins. This means that you don't need to purchase and install special software for your users.
Mobilise your workforce easily. SaaS makes it easy to "mobilise" your workforce because users can access SaaS apps and data from any Internet-connected computer or mobile device. You don't need to worry about developing apps to run on different types of computers and devices because the service provider has already done so. In addition, you don't need to bring special expertise onboard to manage the security issues inherent in mobile computing. A carefully chosen service provider will ensure the security of your data, regardless of the type of device consuming it.
Access app data from anywhere. With data stored in the cloud, users can access their information from any Internet-connected computer or mobile device. And when app data is stored in the cloud, no data is lost if a user's computer or device fails.