Application icon is a graphic visual marking at the screen and introduces itself a program, document or folder in Windows and any other virtual system that is needed to identify one from another. An icon can be displayed on the Desktop, hard and local discs, but on the Desktop in can also be displayed as a tag, if the program is hidden on the disc. A tag icon has an arrow mark at the bottom right side, but in Start menu tags don’t have these marks. Every single program (it is usually known as .exe file) has its own original icon that differs itself from another one. A program icon replaces the extension of files, so in caption to it you will see only a name of file.
A document (especially text, photo, presentation e. g.) usually has an icon of a program, which created it and is needed to open that document for viewing or editing. So, looking at this icon, you will always know what type of file it can operate with. A folder usually has its standard icon, but if user wants to point it out (depending on
its importance for him) among others, he can use a special icon for it like geometrical figures or any kind of picture icon.
On the PC, Notebook or Notepad Desktops icons are displayed in its usual way. In folder they can be seen in different ways: as large, medium, small thumbnails, tile, icons, list or table. On the Desktops of Smartphone,
Secure Telephone or Tablet PC (a.k.a. iPad) they can be displayed in either its usual way, or as 3D diagram, which can display them in many different ways. The most famous and recognizable application icons in Windows system (for PC, Notebook, Notepad etc.) are
My Computer, My Documents, My Music, My Videos, My Images, Trash, Hard Drive, Local Disc, Control panel, Tasks Manager, Downloads, Microsoft Office, Internet Explorer, Skype, Viber, Google e. g. The most recent famous application icons among different mobile operation systems (such as Android for iPhone, iPad etc.) are applications of Apple Store, QR-code reader, Navigator, Java e. g. The more new virtual systems and applications are created and developed, the more new icons appear in virtual world.