title: Characteristics of the abstract class
body: <p>I would like to know what makes a class to be called as an abstract class. I believe, abstract keyword definitely make a class, but if one takes out the keyword, then we can create the instance of the class. </p>
  
  <p>In otherwords, what are the characteristics of the abstract class.</p>
  
  <p>Thanks in advance. </p>
  
  <p>-Harsha</p>