Application program refers to a computer program that completes a certain or more specific work. It runs in user mode, and can interact with users and has a visual user interface.<br>Applications are usually divided into two parts: GUI and engine<br>It is different from the concept of application software. An application is a classification of purposes used, which can be a collection of single programs or other subordinate components, such as Microsoft office, OpenOffice. An application is a single executable or a single program, such as word, Photoshop. In daily life, we can not distinguish the two carefully. Programs are generally considered as an integral part of the software.<br>
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