Zen Cart uses the term Listing Page to refer to a page that shows a number of products in a stack of rows in the center of the page.
The Product Listing Page is a listing page that shows all the products in a category.
The New Products page shows recently added products (as defined in this setting).
The Featured Products page shows products which have been marked as featured.
The All Products page shows all the products in your store.
More information on listing pages is provided in the storefront listing pages FAQ.
The layout for listing pages is described in more detail in listing page layout.
The configuration settings for the New Products, Featured Products and All Products listing pages is explained in new/featured/all products listing page configuration.
The Product Listing page is discussed in more detail in Product Listing page.