A search specifies a set of conditions (also referred to as criteria or rules) that must be true for a feature to be found and selected. A Search can have one or more sets of conditions. You can search the entire map (for example, across multiple feature classes).
For example, you can find just the roads in Shanghai within a circular area you specify. To do this, you specify criteria that limits the results to road features whose City field is "Shanghai" and within the a circle you define.