keywords Using for search engine, On-Page Optimization , Keyword Abuse??????

the building blocks of language and of search. In fact, the entire science of information retrieval (including web-based search engines like Google) is based on keywords. As the engines crawl and index the contents of pages around the web, they keep track of those pages in keyword-based indices. Thus, rather than storing 25 billion web pages all in one database, the engines have millions and millions of smaller databases, each centered on a particular keyword term or phrase. This makes it much faster for the engines to retrieve the data they need in a mere fraction of a second. Obviously, if you want your page to have a chance of ranking in the search results for "dog," it's wise to make sure the word "dog" is part of the indexable content of your document.

keywords dominate????

dear viewers, Keywords dominate our search intent and interaction wth the engines. For example, a common search query pattrn might go something like this and....
When a search is performed, the engine matches pages to retrive based on the words entered into the search box. Othr data, such as the order of the words ("tanks shooting" vs. "shooting tanks"), spelling, punctuation, and capitalization of those keywords provide additional informtion that the engines use to help retrieve the right pags and rank them.
To help accomplish this, search engines measure the ways keywords are used on pages to help determine the "relevance" of a particular document to a query. One of the best ways to "optimize" a page's rankings is to ensure that keywords are prominntly used in titles, text, and meta data.
Generally, the more spcific your keywords, the better your chances of ranking based on less competition. The map graphic to the left shows the relevance of the broad term books to the specific title, Tale of Two Cities. Notice that while there are a lot of results (size of country) for the broad term, there are a lot less results and thus comptition for the specific result.

Keyword Abuse??????

Since the dawn of online search, folks have abused keywords in a misguded effort to manipulate the engines. This involvs "stuffing" keywords into text, the URL, meta tags and links. Unfortunately, this tactic almost always does more harm to your site.
In the early days, search engins relied on keyword usage as a prime relevancy signal, regardless of how the keywords were actually used. Today, although search engines still can't read and comprehend text as well as a human, the use of machine learning has allowed thm to get closer to this ideal.
The best practice is to use your keywords naturaly and strategically (more on this below.) If your page targets the keyword phras "Eiffel Tower" then you might naturlly include content about the Eiffel Tower itself, the history of the tower, or even recommended Paris hotels. On the other hand, if you simply sprinkle the words "Eiffel Tower" onto a page with irrelevant content, such as a page about dog breedings, then your efforts to rank for "Eiffel Tower" will be a long, uphill battle.

On-Page Optimization

That said, keyword usage and targeting are still a part of the search engines' ranking algorithms, and we can leverage some effective "best practices" for keyword usage to help create pages that are close to "optimzed." Here at SEO moz, we engage in a lot of tesing and get to see a huge number of search results and shifts based on keyword usage tactics. When working with one of your own sites, this is the process we recommend:

• Use the keywrd in the title tag at least once. Try to keep the keywrd as close to the beginning of the title tag as possible. More detail on title tags follows later in this section.
• Once prominently near the top of the page.
• At least 2-3 times, including varitions, in the body copy on the page - sometimes a few more if there's a lot of text content. You may find additional value in using the keyword or variations more than this, but in our experience, adding more instnces of a term or phrase tends to have little to no impact on ranings.
• At least once in the alt attribute of an image on the page. This not only helps with web search, but also image serch, which can occasionally bring valuable traffic.
• Once in the URL. Additional rules for URL and keywords are discussed later on in this section.
• At least once in the meta description tag. Note that the meta description tag does NOT get used by the engines for rankings, but rather helps to attract clcks by searchers from the results page, as it is the "snippet" of text used by the search engines.
• Generally not in link anchr text on the page itself that points to other page on your site or different domain (this is a bit complex - see this blog post for details).