What is Software as a Service (SaaS)?

Software as a Service (SaaS), a cloud model defined in NIST SP 800-145, means using software applications online without downloading the application programs on your computers. It is similar to leasing an apartment that comes with furniture without ownership.

Users can simply access the software via a web browser and pay a subscription fee. Examples of SaaS services include Gmail, Microsoft 365 tools like Word, Excel, and PowerPoint, among others, and Salesforce for businesses of all sizes.

Software as a Service (SaaS) is software hosted and maintained by a provider, accessible via the Internet on a subscription basis. It is one of three cloud service models, besides platform (PaaS) and infrastructure (IaaS).

Unlike traditional software installed locally, SaaS applications are accessed through a web browser, removing the need for users to handle installation, maintenance, or updates themselves. For instance, in Google Workspace, Gmail and Google Docs tools are offered as SaaS, where users can use them online and do not require installation.

On the other hand, traditional software is bought with a perpetual license and installed on local computers or servers. Users are responsible for managing updates and backups. For example, a program bought once is installed and updated individually on each computer.

For example, these SaaS applications perform many different tasks:

• Productivity: Google Workspace, Microsoft 365
• Communication: Slack, Zoom
• Customer Relationship Management (CRM): Salesforce, HubSpot
• Project Management: Asana, Trello
• Creative Tools: Adobe Creative Cloud

These are a few examples; numerous SaaS solutions continually emerge to meet diverse needs.

The reasons for the popularity of the SaaS model include:

• Accessibility: You can access the software from your computer with an internet connection.
• Scalability: Modify the subscription to align with business needs.
• Cost-Effectiveness: Pay for what you use.
• Automatic Updates: Automatic updates for features or security patches.

These are the reasons why SaaS is popular among individuals, startups, and large enterprises.

SaaS companies usually make money through the subscription business model, charging users a fee to use the software applications hosted in the cloud by the companies. Such subscriptions can be monthly, yearly, or based on traffic, the number of users, the amount of data processed, or any other measurable parameter.

Some SaaS companies employ freemium models or time-limited offers to attract users, with the expectation that they will upgrade to paid plans for full functionality.