When we talk about a mobile application, we usually mean a program that is designed to run on a mobile device, such as a smartphone. These devices have some special characteristics that we need to consider when writing an application. First, their screen is smaller than a computer monitor. The screen can also be rotated in landscape or portrait orientation. We will also use the touchscreen of the device for input.
The mobile application might also use other features of the device, such as the GPS, sending text messages, or sensing the movement of the device using its accelerometer. These are things we usually can't do if an application runs on a normal computer.
A mobile application can be connected, but it does not have to be. Being connected means that it can communicate with another computer, maybe using the client-server techniques we discussed earlier.
When writing a mobile application, the platform the application will run on is very important...