Blynk for Beginners and help with your project

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Do i understand this correctly? These are the four lines that actually do the work.

> BLYNK_WRITE(vRelayBtn) {     // Blynk app WRITES button status to server
>   vRelayStatus = param.asInt();
>   if(vRelayStatus == 1){
> digitalWrite(relayPin, LOW);        //

2-nd. Line vRelayStatus is getting last recorded state from the server?
3-rd line . If recorded value is 1,
4.th Then do give high signal on physical board pin too. ?

So is this mean that if the last state of the button and led in blynk mobile app and led/relay on physical board was on, i can physically unplug the power of the board,and after that plugged it again.That will automatically give high value on the physical pin of the board led/relay again?