301 Redirect - Permanent server redirect, used in the htaccess file it shows a replacement URL for a deleted page to the search engine spiders.

Algorithm (algo) - Usually a mathematical calculation used by search engines to determine the importance and ranking position for a website.

Alt Text - Description of an image in your website it is showed to the user when the graphic is undeliverable. Alt text are important to describe to the search engines what the image is about.

Analytics - A program to analize statistics for your website. Google analytics is the most popular, free analytics program.

Anchor Text - The text used to describe a link. In SEO anchor text are used to increase your rankings for your targeted keywords.

Authority - Authority sites are websites that rank highly for a specific keyword thanks to their updated unique content and many incoming links from related sites.

Back Link - A link to your site from another website.

Black Hat - Search engine optimization techniques to trick the search engines into thinking that a site is an authority in the subject. Some techniques used by black hat seos are link spamming, keyword stuffing and cloaking.

Blog - Started as online diaries, blogs became popular for the simplicity they provide to the webmaster to add updated content and news.

Bot - An automated software. Search engines use spiders (which are bots) to find and add web pages to their indexes.

Cloaking - A black hat technique to show the search engine a different webpage than the one shown to the user.

Comment Spam - Unrelated or unwanted comments in blogs post to increase backlinks.

CPC (Cost Per Click) - the fee charged by PPC engines for every click received.

Crawler - An automated software used by search engines to spider websites following links and indexing content. Search engines use spiders are also referred as crawlers.

Directory - A human edited site which lists in the form of a directory websites divided into categories.

Feed(rss) - A form to distribute content by using a special code.

Google Bowling - It is said to be a myth. It is the act of lowering your competitors rankings by doing off site optimization using black hat techniques.

Google Dance - The moment when different google datacenters show different search results do to a major update in google algorithms and or databases.

In Bound Link - The same as a back link.

Indexed Pages - The pages in a website that are present in a search engine database.

Inlink - The same as a back link.

Keyword Research - The research to determine which keywords with an existing search volume are appropriate for your targeted audience.

Keyword Stuffing (keyword spam) - High keyword density in a website trying to trick the search engines.

Link Exchange - Reciprocal backlinks between webmaster. I link to you you link to me.

Link Partner - The webmaster or site that is linking back to you in a reciprocal linking scheme.

Link Popularity - The number of back links a website has indexed in the search engines. The higher the link popularity the better chances of ranking high for the targeted keyword.

META Tags - Html codes at in the head section of a website which includes title, description, keywords and other non common tags such as the name of the author and the language of the site.

Natural Search Results - Search Engine Results shown by the website optimization and not paid for.

Nofollow - Html command that specify to a search engines not to follow or to give any importance to a specific link.

NoIndex - Html command to prevent indexing of a webpage by the search engines spiders. Can be placed in the head section of the website or in the robots.txt file.

Non Reciprocal Link (one way links) - A link from a website without a link back to them. Site A links to B but B doesn't link to A. Search Engines consider one way links more relevant.

Pagerank (PR) - A value between 0 to 10 given by google considering the authority of a website based on backlinks and content.

PPA (Pay Per Action) - Similar to pay per click but the publisher only gets paid if the click results in a purchase or sign up.

PPC (Pay Per Click) - A form of advertising where the webmaster pays the publisher for every click it delivers.

Robots.txt - A text file in the root directory of a website used to control and guide search engine spiders.

Sandbox - A time before a new website is allowed to rank by the major search engines after indexing. It is not prooved and is considered a myth.

Scrape - Using bots to copy content from several sources and adding it exactly the same to a website without the author permission.

SE - Abbreviation for Search Engine.

SEM - Abbrevation for Search Engine Marketing.

SEO - Abbreviation for Search Engine Optimization.

SERP - Abbreviation for Search Engine Results Page.

Site Map - A page that shows the structure of a website to spiders and users. Most common formats are html and xml. Xml is mostly used for search engine spiders.

URL - Abbreviation for Uniform Resource Locator or more commonly Web Address

Web 2.0 - Website which allow users interaction.