A mashup is a Website or application that combines the content from two or more separate sites into something new. One example is Bashr, which blends Wikipedia, photo site Flickr, and social bookmarking service Delicious. So a user entering a search term, say “Boundary Waters Wilderness,” would get an article from Wikipedia, Boundary Waters photos from flickr, and all sorts of Web links about the area. Another service, Chicago Crime, contains a police database with Google maps to show the exact location of reported crimes.
The organizers of a recent conference on on hybrid Web sites named Podbop the best Mashup. It helps users discover new music by linking an events listing database to free online music.