Pioneered, in the early 2000s, decoupled CMS is an approach to web application deployment for enhancing the performance and security of WCM systems. It predates the mobile revolution and is designed to deliver content for full-screen Web pages.
Decoupled CMS separates the back-end capabilities for editing, organizing, and storing digital information from front-end capabilities for displaying Web pages on a Web site. These capabilities are hosted on separate servers -- content is synchronized at predefined intervals.
Typically a back-end server hosts editorial and management tasks and runs securely within the confines of a corporate firewall. The front-end server hosts capabilities for constructing web pages, using predefined templates to assemble, format, and present content, often from disparate sources. The front-end server can be deployed outside a corporate firewall, and is readily accessible to connections from across the open Web. Multiple front-end servers can be added to the mix, to increase the performance of Web page delivery.
Headless CMS is now replacing decoupled CMS as the omnichannel deployment solution to accommodate the mobile devices and native mobile apps.