RabbitMQ C# "Read from queue example"

file1.cs

// Declare the queue name
string QueueName = "QTransactions";
// Create a new connection factory for the queue
var factory = new ConnectionFactory();

// Because Rabbit is installed locally, we can run it on localhost
factory.HostName = "127.0.0.1";
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{

    // When reading from a persistent queue, you need to tell that to your consumer
    const bool durable = true;
    channel.QueueDeclare(QueueName, durable, false, false, null);

    var consumer = new QueueingBasicConsumer(channel);

    // turn auto acknowledge off so we can do it manually. This is so we don't remove items from the queue until we're perfectly happy
    const bool autoAck = false;
    channel.BasicConsume(QueueName, autoAck, consumer);

    System.Console.WriteLine(" [*] Waiting for messages." +
                                "To exit press CTRL+C");
    while (true)
    {
        var ea = (BasicDeliverEventArgs)consumer.Queue.Dequeue();

        byte[] body = ea.Body;
        string message = System.Text.Encoding.UTF8.GetString(body);
        System.Console.WriteLine(" [x] Processing {0}", message);

        // Acknowledge message received and processed
        System.Console.WriteLine(" Processed ", message);
        channel.BasicAck(ea.DeliveryTag, false);
    }
}

What does true means here?