SaaS Security refers to securing the attack surface created by organizational-wide SaaS usage, and securing the information found within all those SaaS applications. 

As SaaS usage has grown to the point that nearly all businesses use SaaS in one way or another, so have the risks it brings. Saas security is about protecting everything SaaS related. From the access that SaaS allows, to protecting the very data that resides in the SaaS apps themselves. With proper SaaS security, everyone throughout the organization can use SaaS freely without compromising cybersecurity.