Conceptual design is a phase in the design process that involves developing high-level ideas and concepts for a product, system, or structure. It focuses on defining the overall form, function, and features of a design project before moving on to detailed design and implementation. Conceptual design often involves brainstorming, sketching, prototyping, and iteration to explore different possibilities and refine ideas. This phase is essential for setting the direction and vision of a project, and it can help identify key requirements and constraints that will inform the later stages of the design process. Conceptual design is used in various fields including engineering, architecture, product design, and software development.