IMS content packages can be created and edited using a variety of content-authoring software. Content is usually displayed over several pages, with navigation between the pages. The content-authoring software produces a zip file, which can then be uploaded to your course in Moodle.
The zip file is unzipped automatically in Moodle, and the content of the package displayed.
There are various options for displaying content in a popup window, with a navigation menu or buttons etc.