A Greenfield project refers to a software development project that starts from scratch, without any previous code or infrastructure. It's like building a brand new house on a plot of land that hasn't been developed before. Greenfield projects offer developers a clean slate to work with, allowing them to make decisions without any constraints. They have the freedom to choose the technology stack, architecture, and design patterns that best suit the project's goals. Greenfield projects are exciting but also come with challenges, as they require careful planning and decision-making from the ground up.