Selectors allow page elements to be selected. Single or multiple elements are supported. A Selector identifies an HTML element/tag that you will manipulate with jQuery code.if you want to learn or read about Selectors then use these below links :http://www.w3schools.com/jquery/jquery_ref_selectors.asphttp://api.jquery.com/category/selectors/http://www.codeproject.com/Articles/698312/jQuery-Different-Selectorsin 3rd link you will see all example of selectors.