An aggregator is software or a hosted application that collects RSS feeds from various sources and displays it in a single consolidated view, either in a window on your desktop or in a Web browser. Its purpose is to syndicate Web content such as news headlines, blogs, podcasts, and vlogs in a single location for easy viewing.
There are two main types of aggregators: web-based aggregators and desktop/software aggregators. Web-based aggregators allow individuals to subscribe to feeds online and read RSS feeds in a web browser. Desktop aggregators are software programs installed locally that updates when RSS feeds are updated. The aggregator shows new information and allow for users to read feeds.
In the mobile world, aggregator also refers to an organization that acts as a middleman between content providers and mobile carriers, providing the messaging traffic to the multiple carriers.