What exactly is dynamic memory?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/1021138/differences-between-dynamic-memory-and-ordinary-memory">Differences between dynamic memory and &ldquo;ordinary&rdquo; memory</a>  </p>
</blockquote>



<p>I was reading the C++ tutorial and I don't understand why I need to declare dynamic memory, this is what the tutorial says:</p>

<blockquote>
  <p>Until now, in all our programs, we have only had as much memory available as we declared for our variables, having the size of all of them to be determined in the source code, before the execution of the program.</p>
</blockquote>

<p>And then it says that we have to use new and delete operators to use dynamic memory. 
However, I seem to be using dynamic memory when declare a pointer, e.g. char* p, for which I have not specified the length of the array of characters. In fact, I thought that when you use a pointer you are always using dynamic memory. Isn't it true?
I just don't see the difference between declaring a variable using new operator and not. I don't really understand what dynamic memory is. Can anyone explain me this?</p>
