Grav CMS uses a flat-file architecture, which means that content is stored in files rather than a database. This simplifies the setup and maintenance process, eliminates the need for database configuration, and results in faster performance.

Grav CMS's flat-file architecture, speed and lightweight nature, flexible content structure, Markdown-based content editing, powerful theming and customization options, modular architecture, developer-friendliness, active community and support, and security features make it a great choice for building fast, flexible, and secure websites.