title: What is the use of first (Call<T> call) Parameter in onResponse() and onFailure() method of Retrofit2
body: <p>what is the use of call parameter here?
  how to use call parameter here? why is it there?</p>
  
  <pre><code>call.enqueue(new Callback&lt;somePOJO&gt;() {
  
          @Override
          public void onResponse(Call&lt;somePOJO&gt; call, Response&lt;somePOJO&gt; response){
          }
  
          @Override
          public void onFailure(Call&lt;somePOJO&gt; call, Throwable t) {
  
          }
  </code></pre>