What is the difference between a concept note and a proposal?

A concept note is a brief document that outlines an idea or project, highlighting its purpose, objectives, and potential impact, often used to gauge interest from stakeholders or funders. In contrast, a proposal is a more detailed and structured document that presents a comprehensive plan for implementing a project, including methodologies, timelines, budgets, and expected outcomes. While the concept note serves as an initial pitch, the proposal is a formal request for funding or support, providing in-depth information necessary for decision-making.