what is the "behaviorConfiguration" attribute of service?

what is the "behaviorConfiguration" attribute of service?

<services>
      <service name="WcfServiceNetMSMQ.Service1" behaviorConfiguration="WcfServiceNetMSMQ.Service1Behavior">
        <host>
          <baseAddresses>
            <add baseAddress = "http://localhost:8010/WcfServiceNetMSMQ/Service1/" />
          </baseAddresses>
        </host>
        <endpoint address ="net.msmq://localhost/private/myqueue" binding="netMsmqBinding" contract="WcfServiceNetMSMQ.IService1">
          <identity>
            <dns value="localhost"/>
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>