Application design is the process of creating software applications that are user-friendly and efficient. It involves planning the layout, features, and functionality of the application to ensure it meets the needs of its users. Designers consider aspects like user experience (UX), user interface (UI), and performance to create an application that is not only visually appealing but also easy to navigate. During application design, teams often use tools and methodologies such as wireframes and prototyping to visualize the app's structure before development begins. This helps identify potential issues early on and allows for adjustments based on user feedback, ultimately leading to a more successful final product.