Panels

 Panels 

Panels are dockable windows that provide access to various features, functions, and settings in Photoshop. Panels can be rearranged, grouped, collapsed, or expanded according to your preferences. Panels are dockable and customizable windows that provide access to various features and controls in Photoshop. 

Depending upon the document you are working on, you might need different panels for quick view and convenience and Photoshop offers a great space to display some of them as per your need on the right-hand side of the document area. The most important one would be the layers panel that displays the list of layers your artwork contains while allowing you to select or re-order the layers as per your need along with a collection of actions you can perform over those layers.

Examples of panels include the Layers panel, Color Swatches panel, Brushes panel, and History panel.