title: What does wildcard address in InetSocketAddress mean?
body: <p>In the docs for the constructor <a href="http://docs.oracle.com/javase/7/docs/api/java/net/InetSocketAddress.html#InetSocketAddress%28int%29" rel="noreferrer"><code>InetSocketAddress(int port)</code></a> it says:</p>
  
  <blockquote>
    <p>Creates a socket address where the IP address is the wildcard address
    and the port number a specified value.</p>
  </blockquote>
  
  <p>What does a wildcard address do and what does it means when used in  <code>socket.bind()</code>? </p>