Yes, a single person can handle SEO, especially in the early stages of a business or for smaller websites. However, as a business grows, the complexity and demands of SEO tend to increase, involving aspects like technical SEO, on-page SEO, off-page SEO, content creation, link building, and more. While one person can manage these aspects, it can become time-consuming and may require a broad skill set. SEO is also constantly evolving, requiring continuous learning and adaptation. For larger businesses or websites, an SEO team or hiring an agency might be more efficient and effective.