This panel serves two different functions based on the place where the element has been selected.
As an Information panel (INFO), when a resource has been click in Library. It displays all data from each and every element available in the Media Library. It's also available by clicking on the “Info” icon, visible at the right side of the element in question, you can get a preview of the element and acknowledge data such as file name, length, type, size, format, uploading date, etc. or even changing its name or type if it is a Sprite animation.
As a Properties panel (Properties), it gathers all specific parameters of each element located on the timeline. The number and type of parameters vary substantially according to the element selected, but the functionality of each element will depend upon the settings of these parameters, and so the effects achieved in the project.