Buffer object Node.JS?

Question

Node.js

Until all that is

var net = require("net");
var crc = require("crc");

var svr = net.createServer(function(socket){
  console.log("Connected: "+socket.remoteAddress+":"+socket.remotePort);
  socket.on("data", function(data){
    console.log(data);
    var result = crc.crc16modbus(data);
    console.log(result);
  });
  socket.on("end", socket.end);
});
var svraddr = "185.20.225.164";
var svrport = 7654;
svr.listen(svrport,svraddr);
console.log("Server Created at "+svraddr+":"+svrport+"\n");

I don’t understand what the piece of iron sends me
and what is the Buffer object in the socket.on function

Answer 1

Representing binary data in nodejs: https://nodejs.org/api/buffer.html