Explain the advantages of Salesforce SaaS functionality?

Some of the main benefits of Salesforce SaaS are:

A pay-as-you-go model perfectly suited for all customers.
No hassle of infrastructure management.
All applications are accessed via internet.
Easy integration between various applications.
Latest features are provided without any delay.
Guaranteed uptime and security.
Scalable performance for various operations.
Ability to access via mobile devices from anywhere.