Key words or key phrases are those words that significantly describe the content of a text, article, or database. A single or a group of words is often depicted as keywords. These are reserved words bearing specific meaning in reference to a particular concept. When we search for "bad credit mortgage loans" or "forex system trading" then these are considered to be a single key phrase for indexing a site that contains similar or almost identical information listed by the popular search engines.

These keywords or phrases are the qualifiers that optimize your search results and decide the ranking of a site or blog in a reputed search engine. To get a higher position/rank in the search engines, a website or blog should contain specific keywords related to a particular domain. Search engine Optimization of a website/blog rests on the keyword selection and density or the occurrence of keywords/phrases in a particular text/article.

Keywords are often more than just one word that decides the fate of the blog or website that is indexed or ranked. In addition, more importantly, if a keyword identified in singular state is treated as the relevant keyword for specific domain then its plural it is treated as a different keyword/phrase that might not have the same value or results in search engine optimization.

Keywords are mainly used for cataloguing and searching. Therefore, these need to be significant words or phrases that best depicts the article content. It is elemental to choose keywords strategically significant and specific to the text or articles or content of the web pages. These should best define the content of the pages or sites that are listed in the search engines.

When we are talking about ranking and indexing then not only the use but also repetition of the keywords with context relevance is watched by the search engines. Normally search engines will prefer at least 2-3% key word density. Sometimes the density asked for is as high as 5-20%. It is also preferred that keywords appear in the title/header, first and last paragraphs. Over and above, many prefer it - once in description tag, once in the URL, once in bold and once in italics. Choice of words is equally vital, as these should match the queries generated exactly by the relevant searches in the popular search engines on a specific topic.

If you are newer in internet business then you might also purchase private label articles that are keyword optimized for search engine rankings and indexing. You can also customize these articles according to your specific business needs.

Placing the keywords strategically in your content is also necessary to make your content appear most relevant and prompt the search engines to rank it high. The use and repetition of keywords in a content /article or site actually establishes the significance of the topic. Optimal use of words also ensures the constant flow of quality traffic to a webzine or blog.

Specific sites can help you to assess the effectiveness of certain keywords that you plan to use to reach your niche target. Use of keywords is also vital in getting one way or reciprocal links to and from other sites. Latent Semantic Indexing or multi word phrases usage, Country or Location Specific keywords, analyzing keywords for competition, Effective Keyword Research or following up and monitoring the use of keywords actually form the strong foundation of keyword optimization for successful internet marketing.