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OCR: OCR (optical character recognition) is the recognition of printed or written text characters by a computer. This involves photo-scanning of the text character-by-character, analysis of the scanned-in image, and then translation of the character image into character codes, such as ASCII, commonly used in data processing.
In OCR processing, the scanned-in image or bitmap is analysed for light and dark areas in order to identify each alphabetic letter or numeric digit. When a character is recognized, it is converted into an ASCII code. Special circuit boards and computer chips designed expressly for OCR are used to speed up the recognition process.
OCR is being used by libraries to digitize and preserve their holdings. OCR is also used to process checks and credit card slips and sort the mail. Billions of magazines and letters are sorted every day by OCR machines, considerably speeding up mail delivery.

OFFLINE: When your computer performs an operation when it is not connected to any other computers or the Internet it is working offline.

ONLINE: Your computer is working online when it performs an operation and is connected to other computers or the Internet.

OVERCLOCKING: Overclocking is resetting your computer so that the microprocessor runs faster than the manufacturer-specified speed (for example, setting an Intel 166 MHz (megahertz) microprocessor to run at 200 Mhz). Somewhat surprisingly, this is possible. However, it's more likely to work with an Intel microprocessor than with those of other manufacturers because, according to Tom's Hardware Guide, Intel labels the speed of its microprocessors more conservatively.
Factors that favor your ability to successfully "upgrade by resetting" include (in addition to having an Intel microprocessor): having a well-designed motherboard with a fast enough bus and having a fan or other cooling device that will keep your system cool enough.
The procedure for "overclocking" depends on your combination of factors. The first and most commonly applicable step is to reset your computer's bus speed. The microprocessor is often able to adjust successfully to a slightly higher bus speed. Resetting the bus speed may require resetting jumpers inside your computer. In newer systems with SoftMenu BIOS, the bus speed can be set through your system setup interface.