This paper briefly reviews the literature on writing skill in second language. It commences with a discussion on the importance of writing and its special characteristics. Then, it gives a brief account of the reasons for the weakness of students' writing skill as well as addressing some of the most important topics in L2 writing studies ranging from disciplinary to interdisciplinary to metadisciplinary field of inquiry. In addition, it presents a historical sketch of L2 writing studies, consisting of approaches to teaching writing including behavioristic and contrastive rhetoric as well as discussing approaches to the study of writing including product-oriented, process-oriented, and post-process ones. It also introduces different types of feedback in writing consisting of peer feedback, conferences as feedback, teachers' comments as feedback, and self-monitoring. Finally, it deals with holistic vs. analytic dichotomy in administration of writing assessment.