title: What is the difference between <%, <%=, <%# and -%> in ERB in Rails?
body: <p>Can some one please describe the usage of the following characters which is used in ERB file:</p>
  
  <pre><code>&lt;%   %&gt;
  &lt;%=  %&gt;
  &lt;%  -%&gt;
  &lt;%#  %&gt;
  </code></pre>
  
  <p>what's the usage of each one ? </p>