A headless CMS is a backend-only content management system that acts as a content repository, storing data in JSON format via RESTful or GraphQL APIs. It provides omnichannel control, allowing developers to work with their preferred tools and technologies, and has a low learning curve for content teams. Headless CMS also offers security benefits, such as lower risk of malware attacks, and enables faster delivery of content to new channels. When choosing a headless CMS, consider factors like productivity, security certifications, templates and themes, internationalization support, API documentation, plugin creation capabilities, image optimization, authentication, tech ecosystem support, open-source options, SDKs, data center locations, customer support, cost implications, e-commerce integrations, scalability, and system development. By considering these factors, you can make informed decisions and reduce the risks involved in choosing a headless CMS that meets your business needs.