Validation / Submit Button Question

Validation / Submit Button Question

I guess this is a question of why is it working this way?  I can't see the being normal behavior; what am I missing?

I'm using the validation plugin and I have two buttons within a form.  One is a submit submit<input> and another a button <button>.  When I click on either of the buttons it validates the forms and submits the form?  Why is the <button> causing validation to perform?

Thanks..

Script...
<script>

 $(document).ready(function(){
         $("#cmaForm").validate();
 
  });
 
</script>

Html..
<body>
<form name="cmaForm" id="cmaForm" method="post">
<fieldset>
   <legend>Member Information</legend>
   <p>
     <label for="cname">Name</label>
     <em>*</em><input id="cname" name="name" size="25" class="required" minlength="2" />
   </p>
   <p>
    <button id="next">Next</button>
    <input type="submit" value="FINISH" id="finish"/>
   </p>
 </fieldset>
</form>

</body>