A composition is composed of an introduction, followed by three main paragraph and ended with a conclusion, but first it is important to have a clear understanding of what your teacher expects of your composition. Then, you composition must looked that way :- => Introduction in which the topic is described, the issue or problem is summarized, and your argument is presented =>Main point paragraph 1 in which you make and support your first supporting argument =>Main point paragraph 2 in which you make and support your second supporting argument =>Main point paragraph 3 in which you make and support your final supporting argument =>Conclusion paragraph in which you summarize your argument

What type of composition is it? Take a look at the links on this website and maybe you can make your question more specific: http://www.eslstation.net/ESL100L/302_91_Essay.htm