This refers to a website or an online software application that collects and curates specific types of data from multiple online sources, and then displays it in a single location. There are two types of aggregators, one who collects data from different sources and uses it on their own website, and another who collects data to suit the needs of its visitors. Visitors are draws to these websites because of its ability to create environments which for example, allows easy matching of prices or other essentials. This aggregated data is often provided via RSS feeds. Another popular aggregator is Google Reader.