Spotlight is the system-wide desktop search function that has been a part of Apple’s OS X since version 10.4. (Tiger). Powered by an index of all things and files on the system, it enables the user to easily locate a wide range of items on the computer, including as documents, images, music, apps, and System Preferences. In addition, particular terms inside documents and web pages in the history or bookmarks of a web browser may be searched. As of OS X 10.9, the user may additionally filter searches by file properties (such as creation dates, modification dates, sizes, and kinds) and tags. Spotlight can define words and analyze mathematical statements thanks to pre-installed plugins for the New Oxford American Dictionary and Calculator programs that are both available in OS X.