Software as a Service (SaaS) is a cloud-based computing model in which applications are hosted by a vendor or service provider and made available to customers over the internet. It has become increasingly popular among businesses of all sizes due to its scalability, flexibility and cost-effectiveness. There are two main varieties of SaaS that businesses should consider when deciding which type to use: The Public Cloud and the Private Cloud.

The Public Cloud is the most common type of SaaS and is usually adopted by small to medium-sized businesses. It is a shared environment in which multiple customers can access the same application, making it the most cost-effective and scalable option. However, its shared environment can make it less secure than other types of SaaS.

The Private Cloud is a dedicated environment in which only one customer has access to the application. It is typically used by larger businesses that have high security requirements or require more control over their data. It is generally more secure than the public cloud and provides businesses with more control over their data, but it is usually more expensive due to the dedicated environment.

Ultimately, businesses should weigh the pros and cons of both types of SaaS to determine which is the best option for their business.