If you implement an rss feed into your site then your site will grab articles, pics, videos, etc. from that rss feed. So if you used a rss feed of a news site then the articles from that site would be copied over to yours.
Rss feed is a one type of web feeds and use to publish frequently updated work like news, audio, video, blog entries. An RSS reader aggregates the content for you to view in one place, this saves time and brings you the content like when you're reading a newspaper with the advantage to view only headlines. Setting up RSS feeds and adding them to your website can be a simple process that does not involve a lot of time or any money.