SaaS (Software as a Service) and ISV (Independent Software Vendor) are both services that enable users to access certain software. However, they are fundamentally different in their function.
An ISV is an organization that creates, publishes, and sells software. They usually use the cloud as a means of delivering this software to the users hence using the SaaS method.
SaaS is the method through which vendors share their products with the market. It is one of the most popular services in the world right now. According to BMC, 99% of the organizations will be using at least one SaaS solution by the end of 2021.
SaaS allows users to access the software via the internet as a service by using a subscription model. It eliminates the need to install and maintain software locally hence liberating the users from managing complex hardware and software.