App design is the planning and creation of software applications for digital devices. Apps can be used for communication, learning, games, or everyday tasks. Designers and developers decide how the app looks and how users interact with it. Apps often include features such as buttons, menus, and screens.

App design is used for phones, tablets, computers, and other devices around the world. It takes place in companies, studios, and independent projects. Apps are available in many categories, including education, health, and entertainment.

App design became common in the 21st century with the rise of smartphones and tablets. It has grown as more people use digital devices in daily life. Today, app design is part of how digital tools are created and used globally.