The Content Query Web Part is a tool that site designers can use to aggregate interesting and relevant slices of information on web page by letting you build queries through an easy to use UI and then display that content in unique, configurable ways. The CQWP is designed to return roll-up content over several different scopes, anywhere from a single a list or library, to all lists or libraries across an entire Site Collection. In SharePoint 2010, the CQWP single list query is also optimized to work over large single libraries, taking advantage of smart indices and other tools designed to improve query performance over large document libraries. Content Query WebPart comes first in MOSS 2007, but in SharePoint 2010 there are some new features introduced.Content Query Web Part (CQWP) is used to show information from sites in the current site collection by querying, filtering, and sorting the content. Also CQWP you can show information from list as well as from publishi...