Writing is a skill that requires you to demonstrate that you understand the question asked, that you understand the issues involved and that you have done the appropriate amount of reading. Essays also allow you to demonstrate your analytical thinking and force a deep and powerful form of learning to take place for both the author as well as the reader.The length of the essay should be apt enough to meet the purpose, keep the reader gripped and conform to any pre-stated space constraints. In this application, there are articles and abstracts which includes lots of technical and social discussed topics.