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Algorithm
The secret formula that a Search Engine uses to determine which web pages it will rank for any particular search and in what order those pages will appear in the SERPs.

Back links or Inbound links (IBL)
Links that point to your site from sites other than your own. Inbound links are an important asset that will improve your site's PageRank (PR).

Bait and Switch
Bait and switch is considered as a spam technique when used in SEO. It provides one page for a search engine or directory and a different page for other user agents at the same URL. Sometimes it creates an optimized page and submits to search engines or directory, but replaces with the regular page as soon as the optimized page has been indexed.

Banner Ad
A graphic image, usually a GIF or JPEG, that can be placed anywhere on a web page, most frequently centered across the top. The tile ad is a smaller counterpart, typically grouped with other tile ads along a side margin. The standard banner ad is 468 x 60 pixels; the most common size for tile ads is 125 x 125 pixels.

Black Hat SEO
Black Hat SEO is sometimes called spamdexing (the opposite of White Hat SEO). Black Hat SEO can be any optimization tactics that cause a site to rank more highly than its content would otherwise justify or any changes made specifically for search engines that don't improve the user's experience of the site. In other words, Black Hat SEO is optimizations that are against search engine guidelines. If you step too far over the mark, your site may be penalized or even removed from the index.

For example, adding product reviews to e-commerce site is encouraged, because it adds useful content to the site. However, using bait-and-switch techniques to create a doorway page that hooks people querying for information on soccer, it then leads to information about health products will be unacceptable.

The following Black Hat SEO tactics should be avoided to keep your site away from penalties:

• Keyword, anchor text and domain name stuffing
• Using hidden text or links
• Using techniques to artificially increase the number of links to your pages, such as link farms
• Excessively cross-linking sites to increase link popularity
• Cloaking, delivering different pages depending on the IP address and/or agent who is requesting it
• Doorway / Gateway / Jump Pages
• Duplicate content taken from other sites
• Auto-generated content of no value to the end user
• Spamming forums or blogs
• Excessive outbound

Last but not least, stay close to search engine guidelines is always a good idea while optimizing your site.

Blacklist
Lists that either search engines or vigilante users compile of search engine spammers, which may be used to ban those spammers from search engines or to boycott them.

Blog
Also known as a "weblog". An online diary with entries made on a regular if not daily basis. Some blogs are maintained by an anonymous author who uses a nickname or handle instead of his or her real name.

Body copy
The 'meaty' textual content of a web page. Body copy refers to text visible to users, doesn't include graphical content, navigation, or information hidden in the HTML source code.

Clickthrough
The action of clicking an ad element and causing a redirect to another web page.

Clickthrough rate
The rate at which people click on a link such as a search engine listing or a banner ad. Studies show that clickthrough rates are six times higher for search engine listings than banner ads.

Cloaking
Serving different content to search engine spiders than to human visitors. Cloaking is basically a "bait and switch" tactic, where the web server feeds visiting spiders content that is keyword-rich, thus fooling the search engine into placing that page higher in the search results. Yet when the visitor clicks on the link they are given different content, which may be totally unrelated. Search engines frown upon this practice and some will penalize or ban sites that they catch doing it.