When you look at the home pages of sites like http://www.yahoo.com or http://www.msn.com, you will notice that these pages aggregate information from a number of sources, such as news, email, weather, entertainment, finance, etc. If you think of each of these sources as resources, serving each of these home pages is a result of combining those disparate resources into a single resource whose representation is an HTML page. Such web pages are composite resources; i.e., they combine information from other resources.

Composite | Composite Resources |
RESTful Cookbook | https://restapilinks.com/wp-content/uploads/2021/04/restful-web-services-cookbook.pdf (p.36) |
Apigee Composite Resources | https://www.youtube.com/watch?v=Xt8Jkx_09YE |
Salesforce REST API | https://www.slideshare.net/developerforce/exploring-the-salesforce-rest-api |