Principles are fundamental guidelines or rules that inform and shape the design and development of a product. They are used to make design decisions, evaluate ideas and concepts, and ensure that the final product is consistent and aligned with the overall vision and goals of the team. In creating great user experiences, principles can help product teams stay focused on the user and the problem they are trying to solve and ensure that the final product is usable, valuable, and desirable to its target audience. Principles can be specific to a particular product or organization or more general design principles that apply across different contexts and domains. Regardless of scope or focus, principles can be a powerful tool for product teams to create cohesive, meaningful, and effective products.