Conceptual design is the initial phase of the design process where ideas are generated and explored. It focuses on defining the overall vision and purpose of a project, often involving sketches, diagrams, and models. This stage helps to clarify the goals and requirements before moving on to detailed design. During conceptual design, designers consider various factors such as user needs, functionality, and aesthetics. This phase is crucial for projects in fields like architecture, product design, and software development, as it lays the groundwork for more detailed planning and execution.