Writing is a foundational tool and skill that appears in schools and classrooms around the world. As writing takes on many different forms and is taught in many different ways, one thing remains the same: its purpose is to get a message to the audience. However, the audience should not be limited to an English teacher in an English classroom. This literature review shows the connection of writing and the importance of its use outside of the regular English classroom and being infused into other content areas. As a simple tool to integrate into those other classrooms, writing can boost the students' content knowledge through informative, opinion, and narrative pieces while practicing the skills that have been learned in an English classroom. Writing across the curriculum (WAC) is a movement that emphasizes this point. Looking at many different educational levels and incorporating writing into the curriculum, the ease of integration through a collaboration of teachers and the different methods used will be evident.