Couchbase Server is available in three editions: Open Source Edition (OSE), Community Edition (CE), and Enterprise Edition (EE), each catering to different user needs. OSE is free, providing access to the open-source code for those who prefer customization and self-support, but it lacks formal support and guarantees. CE, also free, offers basic functionality suitable for simple applications with community support, and maintains application portability with EE, though it lacks advanced features and receives updates later than EE. EE is the most comprehensive version, requiring a paid subscription for production use, and includes frequent updates, 24/7 support, advanced high availability, disaster recovery, security features, performance enhancements, and specialized administration tools, making it ideal for large-scale commercial deployments. Each edition shares some core capabilities, ensuring application portability, but EE offers unique features for enhanced scalability, performance, and security, making it the preferred choice for enterprise-level applications.