What is Into what four categories does King divide writers?

In his essay "Why I Write," Stephen King divides writers into four categories: the "recreational," who write for fun; the "professional," who write for a living; the "journalist," who writes to inform; and the "academic," who writes to analyze and critique. Each category highlights different motivations and approaches to writing, reflecting the diverse reasons individuals engage in the craft. This classification helps to understand the varying purposes and audiences that writers may have.