A headless CMS is a backend content management system that separates the content repository from the frontend user interface layer, allowing it to deliver content to multiple "heads" such as mobile apps, chatbots, and voice-activated digital assistants. This approach offers several benefits including improved developer productivity, faster site performance, and increased security. Headless CMSes enable teams to select best-of-breed tools that work for their needs, allowing for a more agile and flexible workflow. They also offer advantages in scalability, internationalization and localization, content editing, API-first approaches, and security. Popular headless CMS platforms include Contentful, Strapi, Ghost, Forestry, Sanity, and Headless WordPress, each with their own strengths and use cases. By decoupling the frontend from the backend, headless CMSes provide a more efficient and effective way to manage content, enabling teams to focus on delivering high-quality experiences across multiple channels.