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Event: In computing it is an action that is usually initiated outside the scope of a program and that is handled by a piece of code inside the program. Typically events are handled synchronous with the program flow, that is, the program has one or more dedicated places where events are handled. Typical sources of events include the user (who presses a key on the keyboard , in other words, through a keystroke). Another source is a hardware devices such as a timer. A computer program that changes its behavior in response to events is said to be event-driven often with the goal of being interactive

Mozilla Firefox is a web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. Official versions are distributed under the terms of a proprietary. Firefox had 22.05% of the recorded usage share of web browsers as of March 2009, making it the second most popular browser in terms of current use worldwide, after Internet Explorer.

Font: In typography it is traditionally defined as a complete character set of a single size and style of a particular typeface. For example, the set of all characters for 9-point is a font, and the 10-point size would be a separate font, as would the 9 point upright. Since the introduction of computer fonts based on fully scalable outlines, a broader definition has evolved. Font is no longer size-specific, but still refers to a single style. Bulmer regular, Bulmer italic, Bulmer bold and Bulmer bold italic are four fonts, but one typeface.

Grayscale: In photography and computing, a digital image is an image in which the value of each pixel is a single sample , that is, it carries only intensity information. Images of this sort, also known as black-and-white are composed exclusively of shades of gray , varying from black at the weakest intensity to white at the strongest.[1] Grayscale images are distinct from one-bit black-and-white images, which in the context of computer imaging are images with only the two colors , and white (also called bilevel or binary images. Grayscale images have many shades of gray in between. Grayscale images are also called monochromatic , denoting the absence of any chromatic variation.



Hexadecimal: In mathematics and computer science (also base , hexa, or hex) is a numeral system with a radix , or base, of 16. It uses sixteen distinct symbols, most often the symbols 0-9 to represent values zero to nine, and A, B, C, D, E, F (or a through f) to represent values ten to fifteen. Its primary use is as a human friendly representation of binary coded values, so it is often used in digital electronics and computer engineering. Since each hexadecimal digit represents four binary digits (bits )-also called a nibble -it is a compact and easily translated shorthand to express values in base two .

Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems.[1] Its use for retrieving inter-linked resources led to the establishment of the World Wide Web . HTTP development was coordinated by the World Wide Web Consortium and the Internet Engineering Task Force (IETF), culminating in the publication of a series of Requests for Comments (RFCs), most notably RFC 2616 (June 1999), which defines HTTP/1.1, the version of HTTP in common use.

Image map: In HTML and XHTML , an image map is a list of coordinates relating to a specific image , created in order to hyperlink areas of the image to various destinations (as opposed to a normal image link, in which the entire area of the image links to a single destination). For example, a map of the world may have each country hyperlinked to further information about that country. The intention of an image map is to provide an easy way of linking various parts of an image without dividing the image into separate image files.



Impression: An online advertisement impression is a single appearance of an advertisement on a web page. Each time an advertisement loads onto a user's screen, the ad server may count that loading as one impression. However, the ad server may be programmed to exclude from the count certain nonqualifying activity such as a reload, internal user actions, and other events that the advertiser and ad serving company agreed to not count. For online advertising, the numbers of views can be a lot more precise. When a user requests a web page, the originating server creates a log entry. Also, a third party tracker can be placed in the web page to verify how many accesses that page had. There are other advertising pricing structures, which are generally referred to as Cost Per Action (CPA) :



Hyperlink-Induced Topic Search (HITS) (also known as Hubs and authorities ) is a link analysis algorithm that rates Web pages, developed by Jon Kleinberg . It determines two values for a page: its authority, which estimates the value of the content of the page, and its hub value, which estimates the value of its links to other pages