Void Send (String data) and void Sendln (String data) is sending a message to the recipient defined. The message that will be sent into the String parameter data.
void Send (String data) and void Sendln (String data) function is required to send a message by the recipient. This message will be sent to the parameter String data.
Void Send (String data) and void Sendln (String data) is preferred to the recipient by the message function. The message to be sent into the parameters String data.