Joomla! Search Engine Optimization: Drive people to your site with this supercharged guide to Joomla! and Search Engine Optimization with this book and ebook.

The .htaccess file is a Linux configuration file for your Apache web server. In the context of SEO, it is used to help your web server determine how to route HTTP traffic. In the world of SEO, the .htaccess file is most commonly discussed in the context of URL aliases for the purpose of creating search engine-friendly URLs.

A 301 redirect is an instruction given to the web server, informing it that a page that was previously located at one URL has been moved permanently to a new URL. The 301 redirect is most commonly used in situations where a site has been rebuilt and the URLs have changed. By adding 301 redirects to the site you are able to avoid missed connections caused by traffic going to the old URL. When a 301 redirect is used, the search engines will also update their indexes to remove the old URL for the page and substitute the new one, thereby preserving the page's indexing.

A 302 redirect, like a 301 redirect, informs the web server that a page has been moved. Unlike a 301 redirect, a 302 indicates that the move is temporary. This option is not favored as some search engines will penalize the use of this sort of redirect.

When a person visits a URL to a page that no longer exists (or has been moved), or types in an incorrect URL, the visitor will automatically be shown a 404 error message. The default message informs the visitor that the page cannot be found. Many sites build custom pages specifically designed to be displayed when 404 errors occur.

AdSense is a Google advertising program aimed at publishers. Website owners can sign up for the AdSense program and then display advertising on their site (the ad inventory is provided by Google, often from the AdWords program discussed next). The website owner will be paid a percentage of the revenue generated when someone clicks on one of the ads displayed on the site.

AdWords is a Google commercial advertising program aimed at advertisers. If you want to advertise on the Google network, you can sign up for the AdWords program, build an ad, and set a daily budget for the display of that ad. The ad will then appear in the Google network and you will be charged when someone clicks on one of the ads, or according to the number of views.

Alexa.com provides a website ranking service that attempts to rate all the sites on the web in order of their popularity. Like a golf score, the lower the score, the better. The most popular site on the web (typically Google.com) has an Alexa Rank of 1. The service, though not 100% accurate and the subject of some criticism, is yet another way of tracking the success of your efforts to raise your site's profile. To learn more visit http://alexa.com.

The HTML image tag<img> is used to place images on the page. The tag includes an option to specify a value for the attribute alt. This attribute is intended to allow webmasters to specify an alternative description for the image, typically for the benefit of users who are using screen readers or browsers with the image display disabled.

Anchors are hyperlinks that allow a user to jump from one place to another within the same page.

A backlink is a link on an external site that points to your site.

The Bing Webmaster service is provided by Microsoft to enable site owners to gain access to some basic tools that help you diagnose and track your site. Registration is free of charge.

Black hat is a label used to describe the use of SEO techniques that are illegal, unethical, or of questionable propriety.

A robot, or "bot" for short, is a software agent that indexes web pages. It is also sometimes called a "spider" or a "crawler."

Canonical URLs are URLs that have been standardized into a consistent form. For the search engines, this typically implies making sure all your pages use consistent URL structures, for example, making sure all your URLs start with "www.".

Cloaking is a black hat SEO technique that involves presenting the search engine spider with different content than you show a normal site visitor.

Crawl depth is a measure of how deeply the search engine spider has indexed a website. This is typically an issue relevant for sites with a complex hierarchy of pages. The deeper the spider indexes the site, the better.

Deep link is a hyperlink that points to something other than the front page of a website.

A doorway page is a page built specifically to point users to another page. This technique is used legitimately when a site owner holds multiple domain names and wishes to channel all the traffic into a primary domain. The technique is often used inappropriately by some black hat SEO practitioners as a way to create highly optimized pages targeting a specific term or terms, then push the users to another site an online variation of the old bait and switch routine.

This is a theory that search engines penalize sites that repeat content, or use content that is duplicated from another source. The theory is controversial, with many believing that the penalty may not exist, or may only be enforced in situations where there are other factors that indicate bad intent.

The Google Webmaster service is provided by Google to enable site owners to gain access to some basic tools that help you diagnose and track your site. Registration is free of charge.

Internal link density is the number of self-referential links on a site; that is, the number of links on a site pointing to other pages on the same site.

KEI is an acronym standing for Keyphrase Effectiveness Index. The KEI is normally used during key phrase research in an attempt to find the optimal key phrases for a site. It is a simple ratio, most often defined as:

frequency of search engine queries for the term / number of pages competing for the term

The more the searches, the more the potential traffic. The lower the competition, the easier it is to rank highly in the SERP. The most ideal term will have low competition and a high number of searches.

Keyphrase density is a calculation done by looking at all the text on a page, then calculating a ratio that represents the total number of words to the number of times a particular key phrase or key word appears on that page.

A keyword is a word being targeted for a site's SEO efforts. A keyphrase is simply the targeting of a phrase instead of a single word.

Keyphrase stuffing is the over-optimizing of a page for a particular keyphrase. This is a disfavored practice that can have a negative impact on your site's ranking as it is viewed by the search engines as an attempt to exert inappropriate influence on the rankings for the page.

A landing page is a web page that has been optimized to capture a customer, and is typically used as the target for an ad or other promotional campaign or simply for capturing leads.

Link building is the process of seeking out or creating links to a site for the purpose of increasing the site's search engine relevance.

A link farm is a site that includes an excessive number of links. These sites are typically built purely to generate links for SEO purposes. Sites of this nature are disfavored by search engines, which view them as inappropriate attempts to exert influence over rankings.

When you create a hyperlink on a page by wrapping a text string with an<a> tag, the text wrapped by the tag is referred to as the link, or anchor, text. There is a search engine optimization benefit to using text for hyperlinks, as the text can then be indexed in conjunction with the hyperlink.

In general terms, the long tail of a distribution is the trailing end of the distribution. In the context of SEO, the term is used to refer to targeting longer and more specific search queries, where there is usually less competition.

Metadata is, quite literally, data about data. On the web, meta tags are the most common implementation of metadata, and in the past they were a key part of search engine indexing. Today, meta tags are still in use on the web and can be found in the head section of web pages.

MozRank is a site ranking algorithm formulated by SeoMoz. It is often used in SEO circles as an alternative to Google's PageRank.

nofollow is a possible value for the rel attribute inside the<a> tag. If the value of the rel attribute for a link is set to nofollow, the search engines' spiders will not follow or index the link.

Organic rank refers to natural search engine ranking, as opposed to paid ranking.

Outbound link is a hyperlink on one site pointing to an external site.

Page rank is a ranking algorithm created by, and named for, Larry Page at Google. The ranking criteria are unknown, but the scale ranges from zero at the low end to 10 at the high end. The higher the score, the more persuasive a website is deemed to be. There is an argument, however, that the rank is no longer in use at Google and may not continue to evolve.

PPC is an acronym standing for Pay Per Click advertising. If you use a PPC advertising scheme, you pay every time someone clicks on one of your ads. The most popular PPC system is the Google AdWords program. It is also sometimes called "pay for performance advertising".

Reciprocal link is a link from one site to another, given in exchange for a link back; a link exchange between webmasters, done in hopes of boosting both sites' rankings.

Redirect is an instruction given to the web server to redirect traffic seeking one URL to a different URL. There are different types of redirects; see 301 redirect and 302 redirect, explained earlier in this chapter.

Robots.txt is a file containing instructions for search engines' robots. This file is located on the server but is not used by the human visitors to the website.

SEF URLs is an acronym standing for Search Engine Friendly URLs. The term refers to the creation of URLs that use natural words and phrases, rather than query strings and other abstract values (such as numbers) not associated with the page content.

SEM is an acronym standing for Search Engine Marketing. The term is broad, and applies to not only search engine optimization, but also to other techniques, such as social media, pay per click advertising, and other marketing techniques focused on search engines.

SEOMoz is a popular commercial SEO consultancy service. Learn more at http://www.seomoz.org.

SERP is an acronym standing for Search Engine Results Page.

SMO is an acronym standing for Social Media Optimization. It is the process of using social media to drive traffic to your site and the related process of making your site suitable for social media, for example, by including social bookmarking tools and other social sharing devices on the site's pages.

Splash page is an entry page, typically decorative, used to greet visitors to a website.

These are words included in search queries that are not actively indexed, unless included in quotations (phrase search). Typical examples include articles and conjunctions: the, a, and or.

White hat is a label used to describe the use of SEO techniques that are legal, ethical, or exhibit best practices.

XML site maps list the pages on a website in a format that is easily digestible by search engines' agents. The site maps follow a standard convention agreed upon by all the major search engines. The XML site map is typically not visible to site visitors, and should not be confused with the normal site maps often used on the front end of websites.