The articles template is a special page that is assigned in the navigation tree. This can be done by navigating to "Content" > "Pages" > "Navigation" and adding an item with the link "All Articles".  Please note that this only supports one Articles page per site.

This template displays the 3 most recently featured articles and a list of all published articles. Recommended image sizes for each article are 290px wide by 180px tall.

Detailed article help can be found at http://help.monkcms.com/article/articles/