In many competitive exams you are asked to write classification essays. You will not be able to write anything substantial if you do not know what it is. A classification essay is just like any other essay with the difference that its format is based on segmentation. It needs to have a good introduction though. If you are well versed in English you will know that any essay requires a striking introduction. The introduction should be such that it gives the reader an idea of the whole essay.
Classification essays are based on real life examples and loads of statistical data. Talk about native and foreign companies if you writing an essay on software companies in a particular country. If there is a positive approach for a particular company you will need to give data and records of that company. Nothing in the essay can be vague. A classification essay is always critically evaluated and your logical abilities are checked via the essay. There is no place for stories.
Writing such kind of essays can become easy if you read newspapers regularly. The writing style is argumentative. Good essay writers always give true facts and figures in support of the arguments written by them. Your opinion can be strong but the way you present it matters a lot.