A backlink is a link coming from another website to your own. The number and quality of backlinks that your site has can affect your search engine optimization efforts, as some search engines provide significant weight to the backlinks of a site.

A backup is a copy of a file kept in case of computer malfunction.

Design that continues to work with earlier versions of a user agent, language, program, etc.

A bad neighborhood on the Web is any website that uses any dirty tricks to try and increase their site's rankings or do harm to customers reading the site.

Bandwidth is the amount of data that can be transferred over the network in a fixed amount of time. On the Internet, it is usually expressed in bits per second (bps). A hosting server will allocate your site a fixed amount of bandwidth usage within a regular period of time.

A (most often graphic) advertisement placed on a web page, which acts as a hyperlink to an advertiser's web site.

Banner blindness describes the condition of people ignoring webpage design elements that resemble advertising banners.

The number of symbols per second sent over a channel.

Also known as scroll or the information appearing on a web page that is visible once scrolling down.

The smallest unit of data stored in a computer. A bit can have the value of 0 or 1. A computer uses 8 bits to store one text character.

A bitmap is a pixel-based image file. Each pixel within the image is assigned a colour value creating the final image.

Block-level elements typically contain inline elements and other block-level elements. When rendered visually, they usually begin on a new line. Examples of block level elements include paragraphs, headings, divs, and blockquotes.

Blog is short for Weblog and is a Web page that has short, frequent updates made to it. Similar to a Web journal or "what's new" page.

A bookmark is another word for internal link or anchor on a web page. An anchor is a link that links within the same page of the document.

A boolean attribute in XHTML is an attribute that is either on or off. If the attribute is present, it takes effect, otherwise it does not. In valid XHTML, all attributes must have a value, so boolean attributes are written boolean="boolean". For example test

A website’s bounce rate is the percentage of people who leave the site from the same page they entered the site, without clicking through to any other pages. This can be a good indicator of how good a website’s navigation is, as well as an indicator of the quality of the site’s content (a very high bounce rate doesn’t bode well for either of those things).

In Web design a breadcrumb or breadcrumb trail is the part of the navigation that shows you where you are, similar to the fairy tale "Hansel and Gretel". Breadcrumb trails are often found near the top of Web pages and define both the current location within the site hierarchy as well as primary pages above the current page.

Brightness is a measure of how vivid a color or hue is. The sun has high brightness, while a candle has low brightness.

Broadband is a form of data transmission where a single medium (wire) can carry different types of information simultaneously. For example; a single cable may provide internet access, telephone and cable television.

Often called a Web browser, it is simply a software application used to interpret HTML commands and display page content.

This is the default style sheet within a browser. If a designer declares no style rules, the defaults from the browser are applied. Most browsers apply style sheets to all web documents. Although these style sheets vary from browser to browser, they all have common traits like black text, blue links, purple visited links etc. These are referred to as the "default" browser style sheet.

A web based public system for sharing discussions, files, and announcements.

A computer storage unit containing 8 bits. Each byte can store one text character.