Noreal-timewebapplicationcouldbepossiblewithoutJavascript.WhileVanilla(plain)Javascriptcouldbeusedtodevelopreal-timeapplications,itisverydifficulttolearnandcodeonpureJavascript.JQuery,averypopularJavascriptlibrarywasdevelopedforwebinterfaceanditissufficientlyefficient.