A mobile application is a computer program designed to run on mobile devices such as smartphones and/or tablet.
Mobile application development requires the use of specialized integrated development environments. Apps are first tested using emulators and later to field testing. Emulators provide an inexpensive way to test applications on mobile phones to which developers may not have physical access.
Mobile user interface (UI) Design is also important. Mobile UI considers constraints and contexts, screen, input and flexibility as frameworks for design. Mobile UI design’s goal is primarily for a comprehensible, user-friendly interface.