Answer Description

Spotlight is an application built into Mac OSX to allow for quick searching of files, applications, system preferences and integration with some search engines.

Wikipedia

Spotlight is a system-wide desktop search feature of Apple's macOS and iOS operating systems. Spotlight is a selection-based search system, which creates an index of all items and files on the system. It is designed to allow the user to quickly locate a wide variety of items on the computer, including documents, pictures, music, applications, and System Preferences. In addition, specific words in documents and in web pages in a web browser's history or bookmarks can be searched. It also allows the user to narrow down searches with creation dates, modification dates, sizes, types and other attributes. Spotlight also offers quick access to definitions from the built-in New Oxford American Dictionary and to calculator functionality. There are also command-line tools to perform functions such as Spotlight searches. Spotlight was first announced at the June 2004 Apple Worldwide Developers Conference, and then released with Mac OS X 10.4 Tiger in April 2005.A similar feature for iOS 3.0 with the same name was announced on March 17, 2009.