Some pages use the "related_news" custom tag or similar to list the most recent news articles based on a specific keyword. Mostly these will be country pages where the name of the country, spelled in correct English, all lowercase will be the keyword. Similar have been done with some thematic pages - here are listed some of them. Note that since editors can setup new pages like this anytime they wish (instructions here) they should also add new keywords used here.
Specifying any of these as keyword in your news article will make it show on the corresponding page. Note that it must be spelled out exactly as done here to work and be placed in the keyword field.
Also read about creating and inserting your own related_news custom tag in a page. If you do create a new keyword which is not a country name you might want to edit this FAQ page to include your new keyword.