App store

An app store (or app marketplace) is a type of digital distribution platform for computer software, often in a mobile context. Apps provide a specific set of functions which, by definition, do not include the running of the computer itself. Apps are designed to run on specific devices, and are written for a specific operating system (such as iOS, Mac OS X, Windows, or Android). Complex software designed for use on a personal computer, for example, may have a related app designed for use on a mobile device.

Such a mobile app may offer similar, if limited, functionality compared to the complete software running on the computer. Apps optimize the appearance of displayed data, taking into consideration the device screen size and resolution. Besides providing continuity of functionality over two different types of devices, such apps may also be capable of a file synchronization between two dissimilar devices, even between two different operating system platforms. App stores typically organize the apps they offer based on these considerations: the function(s) provided by the app (including games, multimedia or productivity), the device for which the app was designed, and the operating system on which the app will run.

App Store (iOS)

The App Store is a digital distribution platform for mobile apps on iOS, developed and maintained by Apple Inc. The service allows users to browse and download applications that are developed with Apple's iOS SDK. The apps can be downloaded directly to iOS devices such as the iPhone smartphone, the iPod Touch handheld computer and the iPad tablet computer, or onto a personal computer via iTunes.

The App Store has more than 1.4 million apps and more than 100 billion copies of apps have been downloaded. Apps may be downloaded for free or for a set cost, and they may include in-app monetization (costs levied from sale of virtual goods and/or advertising). Apple takes 30 percent of all revenue generated through apps, and 70 percent goes to the app's publisher.

History

In the beginning, the NeXT Computer and the object oriented development tools and libraries it relied on, were used to develop the first electronic "app store": the Electronic AppWrapper in the early 1990s. This same technology concept was used to create the iTunes music store and later the iOS App Store.

App

App, apps or APP may refer to:

Computing

Education

Entertainment

JPEG

JPEG (/ˈdʒeɪpɛɡ/ JAY-peg) is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPEG typically achieves 10:1 compression with little perceptible loss in image quality.

JPEG compression is used in a number of image file formats. JPEG/Exif is the most common image format used by digital cameras and other photographic image capture devices; along with JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the World Wide Web. These format variations are often not distinguished, and are simply called JPEG.

The term "JPEG" is an abbreviation for the Joint Photographic Experts Group, which created the standard. The MIME media type for JPEG is image/jpeg, except in older Internet Explorer versions, which provides a MIME type of image/pjpeg when uploading JPEG images. JPEG files usually have a filename extension of .jpg or .jpeg.

Graphical Environment Manager

The Graphical Environment Manager (GEM) was an operating environment created by Digital Research, Inc. (DRI) for use with the DOS operating system on the Intel 8088 and Motorola 68000 microprocessors.

GEM is known primarily as the graphical user interface (GUI) for the Atari ST series of computers, and was also supplied with a series of IBM PC-compatible computers from Amstrad. It also was available for standard IBM PC, at the time when the 6 MHz IBM PC AT (and the very concept of a GUI) was brand new. It was the core for a small number of DOS programs, the most notable being Ventura Publisher. It was ported to a number of other computers that previously lacked graphical interfaces, but never gained popularity on those platforms. DRI also produced FlexGem for their FlexOS real-time operating system.

History

GSX

GEM started life at DRI as a more general purpose graphics library known as GSX (Graphics System eXtension), written by a team led by Don Heiskell. Lee Lorenzen (at Graphic Software Systems, Inc.) who had recently left Xerox PARC (birthplace of the GUI) wrote much of the code. GSX was essentially a DRI-specific implementation of the GKS graphics standard proposed in the late 1970s. GSX was intended to allow DRI to write graphics programs (charting, etc.) for any of the platforms CP/M-80, CP/M-86 and MS-DOS (NEC APC-III) would run on, a task that would otherwise require considerable effort to port due to the large differences in graphics hardware (and concepts) between the various systems of that era.