News articles need to include very specific information. They have a standard structure that is rarely altered. They focus on timely event or development.
Feature articles are longer pieces that involve more than just reporting timely facts to the reader. These are human interest stories that tell about a person, place, event, or trend in more depth than a typical hard news story.
A press release is a document written for the media, not the public. The press release is meant to provide the media with the information necessary to write an article about a specific topic (though the news writer will often need to contact additional sources for a balanced article). Press releases have a set format.