Mac OS X offers a number of search features you can use to find files or folders:
Predefined searches listed in the sidebar make it quick and easy to conduct a search.
Spotlight enables you to perform a search quickly, no matter what application is active. Search results appear in a Spotlight menu or in a search results window.
A Finder window’s Search field enables you to initiate a search based on file name or content from a Finder window. Search results appear within the window, sorted by file type.
The Finder’s Find command takes Finder searching a step further by offering additional search options, including the ability to find files based on kind, dates, labels, size, and other criteria.