GrowthBook is a platform that provides both feature flagging and experiment analysis functionalities. It is designed to be modular, allowing for use in various combinations according to the needs of the team or project. The platform facilitates the creation and management of feature flags, which can be configured for different user segments and environments, supporting boolean, number, string, and JSON feature types. These flags can be used to control access to new features, enabling a more manageable rollout process and the ability to conduct A/B testing.