Fluid is the new user interface found in PeopleSoft 9.2. It is a responsive interface ideal for use on mobile devices like phones and tablets. Want to start developing Fluid applications? Here are two videos that can help you start with Fluid.
Since PeopleTools 8.55 the default interface for PeopleSoft applications is the Fluid interface. While this is very convenient for self service functionality, not all back office functionality is available in Fluid.
This article describes how to revert to the classic interface.