What is salesforce CMS?
Salesforce CMS is a hybrid content management system, where you can curate and share content, manage multiple language versions of your content, and control who creates what. Use Salesforce CMS to create, manage, and deliver content from a central location, and then share that content across multiple channels. (Credits and Reference)
Advantages of CMS
1. Users having basic salesforce knowledge can create or update the content
2. Content can be updated multiple times as multiple versions and based on the business needs users can publish the appropriate content