A gateway is either hardware or software that acts as a bridge between two networks so that data can be transferred between a number of computers. For example, when you send an e-mail to a friend or when you log in to a Web site, there is a gateway that allows the connection take place. Often, your connection to a Web site will involve many smaller connections to other servers along the way. In these cases, a number of gateways are used.

In a completely unrelated story, Gateway is also the name of a popular direct-order PC manufacturer.

GHz- Gigahertz (GHz) most often refers to the clock speed of the central processing unit, or CPU; the faster the CPU clock can tick, the faster, in general, the computer can process data and instructions

GIF: stands for Graphics Interchange Format and is one of the two most common file formats for graphic images on the World Wide Web. The other is the JPEG.

Gigabyte- A unit of computer memory or data storage capacity equal to 1,024 megabytes (230 bytes).

The Gopher technology was invented at the University of Minnesota, whose mascot is, not surprisingly, the Golden Gopher. The gopher system allows people to search for and retrieve information using a text interface. The technology is based on a client-server structure, where a gopher client program is used to search gopher servers. These servers can store documents, articles, programs, and other information. Instead of hyperlinks, the gopher interface uses menus of links to other documents and programs.
The University of Minnesota began a licensing program for the gopher technology in 1993 as the use of gopher was spreading rapidly over the Internet. However, this was around the same time that the World Wide Web was introduced. Because the Web used hypertext and images, it soon became the preferred way to search and browse for information. While there are still servers and client programs that use gopher technology, their use is not nearly as widespread as the Web.

GPU- Stands for "Graphics Processing Unit". It is a single-chip processor like the CPU,, however the GPU is used primarily for computing 3D functions. This includes things such as lighting effects, object transformations and 3D motion. Because these types of calculations are rather taxing on the CPU, the GPU can help the computer run more efficiently.

GUI- Stands for "Graphical User Interface" and is pronounced "gooey." It refers to the graphical interface of a computer that allows users to click and drag objects with a mouse instead of entering text at a command line. Windows and Mac OS are GUI-based.f


A graphic is an image or visual representation of an object. Therefore, computer graphics are simply images displayed on a computer screen. Graphics are often contrasted with text, which is comprised of characters, such as numbers and letters, rather than images.


Grayscale is a range ofmonochromaticshades from black to white. Therefore, a grayscale image contains only shades of gray and no color.Whiledigitalimages can be saved as grayscale (or black and white) images, even color images contain grayscale information. This is because eachpixelhas a luminance value, regardless of its color. Luminance can also be described as brightness or intensity, which can be measured on a scale from black (zero intensity) to white (full intensity). Most imagefile formatssupport a minimum of 8-bit grayscale, which provides 2^8 or 256 levels of luminance per pixel. Some formats support 16-bit grayscale, which provides 2^16 or 65,536 levels of luminance.