explain this code step by step with snippets:

#include 

SoftwareSerial GSMSerial(7, 8);

void setup() {
 Serial.begin(9600);
 GSMSerial.begin(19200);

 delay(1000);
 smsSend();
}

void loop() {
 smsReceive();
}

void smsReceive() {
 if (GSMSerial.available()) {
 Serial.write(GSMSerial.read());
 }
}

void smsSend() {
 Serial.println("Executed");
 // return;

 GSMSerial.println("AT");
 delay(100);
 GSMSerial.println("AT+CMGF=1");
 delay(200);

 GSMSerial.print("AT+CMGS=\"");
 GSMSerial.print("+"); // mobile number with country code
 GSMSerial.println("\"");
 delay(500);
 GSMSerial.println("dsaasd"); // Type in your text message here
 delay(500);
 GSMSerial.println((char)26); // This is to terminate the message
 delay(500);
}
user