JQuery are basicaly class libraries devolped in javascript.There are different version as well as different class libraries devolped for totaly different purpose i.e some fore animation,draggable,dropable and similer functionalities have different libraries.
There are a set of functions, events ,in the same way selectors.it is much easy to select a html controle on page its child controle,the selected value in case of radio button or dropdown list, the parent controle in short you can select any thing on the page in much simple way.
$ sign is the shorthand notation of jquery().
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