Web and Requirements Engineering have been well-recognized as two individual active areas of research in the past. Convergence between these two notable areas has been a point-of-discussion in recent years and offers new avenues of research. This paper explores this alliance from two perspectives; firstly, where Requirement Engineering can be viewed as a process for Web application development as it primarily concerns with adapting the Requirement Engineering process to the Web applications which are special in characteristics as compared to traditional software applications and secondly, where Web can be viewed as a supporting technology for improving the requirements engineering process and enabling new capabilities. The basics of this two-way relationship are examined along with state-of-art and potential opportunities to equip a better understanding.