Substack is an online platform enabling independent writers and creators to create and distribute content to their readers. Substack provides tools to easily create and manage newsletters and other content. Writers can use the platform to engage with readers, monetize their content, and grow their audience. Substack also provides the ability for readers to subscribe to the content, enabling writers to build a steady revenue stream from reader subscriptions. Substack's powerful and user-friendly platform enables writers to focus on creating content and building their audience, rather than spending time on the technical aspects of running a website.