OCR
Optical Character Recognition. OCR software tries to convert for example scanned text into editable text by recognizing the individual characters.


OLED
Organic Light Emitting Devices, organical synthetic material as glowing layer for mobile phone and camera displays.


On the fly
Conversions and modifications take place nearly without temporal delay while the originally initiated activity is still running.





OpenGL
The Open Graphics Language was at first adopted for computer animations on High-End Silicon Graphics Workstations, but is also used by many computer games.


Operating System
The controlling unit of the computer, which is being loaded at first. The operating system allows the user to manage files or start programs. Common operating systems are for example Windows, DOS, Linux, AmigaOS, OS/2 and MacOS.


Open Source
Open Source describes software which is not only available for free but also provides the source code to the public. This way, everyone is able to improve the software and publish own enhancements. Most famous example: Linux.


OS
OS is an operating system.


OS/2
Operating System/2. Window-oriented operating system by IBM, working in a similar way like Microsoft Windows.