Mobile-First Design is a design approach that prioritizes the mobile user experience before scaling up to larger devices like tablets and desktops. This method involves designing the smallest screen first, ensuring that the core content and functionalities are accessible and user-friendly on mobile devices. The design is then progressively enhanced for larger screens, adding more features and improving the layout as screen real estate increases. The Mobile-First approach is driven by the growing prevalence of mobile device usage, making it crucial to deliver optimal experiences on smaller screens where users are often limited by bandwidth, processing power, and input methods.

By adopting a Mobile-First strategy, designers ensure that essential elements of the website or application are prioritized, leading to cleaner, more focused interfaces that perform well under the constraints of mobile devices. This approach also aligns with responsive web design principles, where layouts adjust dynamically based on the screen size, providing a consistent and accessible user experience across all devices. As mobile usage continues to dominate, Mobile-First Design has become a best practice in the digital design and development industry.