An Overview of Panels The Panels module allows a site administrator to create customized layouts for multiple uses. At its core it is a drag and drop content manager that lets you visually design a layout and place content within that layout. Integration with other systems allows you to create nodes that use this, landing pages that use this, and even override system pages such as taxonomy and the node page so that you can customize the layout of your site with very fine grained permissions. Integration with CTools module Panels 3 utilizes the CTools' system of "context" so that the content you place on the page can be aware of what is being displayed. Panels uses Contexts - What are they? In a Panel, you can create contexts, which represent the objects being displayed. In addition, these contexts can be checked for information and use that not only to make content available to be displayed, but to choose which layout to display! Panels can also be used for items smaller than pages.
Related: Drupal 7 Modules
Related: Modifications structure et apparence