Challenge: The challenge refers to the key problem or obstacle that needs to be addressed, whether it's related to user needs, technical limitations, market competition, or design complexities. Identifying the challenge is crucial for guiding the design process and setting clear objectives. Solution: The solution is the approach or strategy implemented to overcome the challenge. It includes design decisions, features, and innovations aimed at meeting user needs, improving usability, and achieving business goals. The solution is evaluated through testing and feedback to ensure it effectively solves the identified problem.