A content aggregator is an individual or organization that gathers Web content (and/or sometimes applications) from different online sources for reuse or resale. There are two kinds of content aggregators: (1) those who simply gather material from various sources for their Web sites, and (2) those who gather and distribute content to suit their customer's needs. The latter process is called syndication. ScreamingMedia, Moreover, and iSyndicate are among the increasing number of companies offering aggregated content for resale.
Various Extensible Markup Language (XML) formats are making content easier to aggregate and redistribute.