There are several interactive widgets available in Muse which fall under the umbrella term of Composition widgets. They consist of a small container which is known as the "trigger" and a larger container called the "target". When you click on the trigger, something happens in the target. An example of this would be a photo gallery where a user clicks on a thumbnail image and a full-sized version is displayed in the container. For example, you can use a Basic Composition widget to create a photo gallery, with thumbnail triggers that display the full-sized photos when the user clicks on the trigger.
The Composition section of the Widget Library menu includes the following:
Blank: This widget consists of a number of small thumbnails, which you link manually to the larger container area. When the thumbnail is clicked the content of the large container changes accordingly.