A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Histogram
Generally a graph of brightness. It ranges from black through grey to white along the horizontal axis, while values in the vertical axis represent the number of Pixels at the appropriate brightness. It provides a means of checking the Exposure of the image. If too many pixels are present at the left-hand side of the histogram, it's likely that the image is underexposed while if it's weighted to the right then it's likely to be overexposed. A histogram function is built into some of the more sophisticated digicams so you can instantly see whether the exposure needs adjusting by looking at the graph.

Hits
Hits - the number of times a web page has been visited. Every time you go to a web page it counts as a "hit".

Hot-sync
A method of transferring data to or from a mobile information device such as a PDA or mobile phone, by 'synchronizing' the phone with a desktop computer.

Hyperlink
A connection linking different pieces of information on the web. Hyperlinks (or 'hot links') appear as hot spots on a web page, in the form of highlighted words or images. By clicking on the hyperlink, the reader can instantly jump to another part of your site or to a completely different website.