Key phrase – A key phrase is a phrase / expression made up by more keywords. A web site is not optimized or it doesn’t rank in search engines, instead of that it is optimized and ranks for certain key phrases. A good key phrase should respect more criteria: being powerful enough (being searched by a lot of people), having quite a low or at least a decent competition (not competing with huge, heavily optimized sites) and being relevant with the site theme. If a site is optimized for a key phrase that fails at least one of these criteria than most likely the whole SEO campaign will fail. It is also called a keyword phrase.

Keyword phrase – A keyword phrase is a phrase / expression made up by more keywords. A web site is not optimized or it doesn’t rank in search engines, instead of that it is optimized and ranks for certain keyword phrases. A good keyword phrase should respect more criteria: being powerful enough (being searched by a lot of people), having quite a low or at least a decent competition (not competing with huge, heavily optimized sites) and being relevant with the site theme. If a site is optimized for a keyword phrase that fails at least one of these criteria than most likely the whole SEO campaign will fail. It is also called a key phrase.

Keyword – A web site is not optimized or it doesn’t rank in search engines, instead of that it is optimized and ranks for certain keywords. A good keyword should respect more criteria: being powerful enough (being searched by a lot of people), having quite a low or at least a decent competition (not competing with huge, heavily optimized sites) and being relevant with the site theme. If a site is optimized for a keyword that fails at least one of these criteria than most likely the whole SEO campaign will fail. Even more, since most of the time the competition for keywords is very strong, is highly recommended to have a site optimized for a key phrase (which consists of more keywords) instead of only a keyword.

Keyword density – The keyword density shows the importance of a keyword relative to a certain page and is calculated with the following simple formula: number of occurrences of the keyword / total number of words in the page; so for example if our keyword appears 10 times in a page with 200 words than we have a keyword density of 5% for our keyword. It is one of the in-page SEO factors. In the past the higher the keyword density was, the higher the page ranking was. However, nowadays search engines penalize sites with a very high keyword density (because most of the times this equals with spam).  Most SEO experts recommend a keyword density between 2% and 8%, anything lower or higher than this will most likely negatively affect the page.

Keyword popularity – The keyword popularity is a measurement unit that approximates the number of searches done on the whole Internet for a given keyword in a month. There are several sites (like Overture - inventory.overture.com) or tools (like WordTracker – www.wordtracker.com) that offer this kind of information. Although all these tools are great when it comes about comparing the popularity of two or more keywords, please note that they are able to offer only rough estimations only and not the exact number of searches performed for that keyword. It is also called keyword power.

Keyword power – The keyword power is a measurement unit that approximates the number of searches done on the whole Internet for a given keyword in a month. There are several sites (like Overture - inventory.overture.com) or tools (like WordTracker – www.wordtracker.com) that offer this kind of information. Although all these tools are great when it comes about comparing the popularity of two or more keywords, please note that they are able to offer only rough estimations only and not the exact number of searches performed for that keyword. It is also called keyword popularity.

Keyword prominence – The keyword prominence is a measurement unit that determines the quality of a keyword placement within a page, text or tag. There are some advanced tactics to increase a keyword prominence, however the easy rule is that closer of the beginning of the page, text or tag the keyword is the higher its prominence will be. It is one of the in-page SEO factors.

Keyword research – The keyword research is a must-do research for any SEO campaign. Its goal is to determine a list of the best keywords and key phrases a site should be optimized for. A good keyword or key phrase should respect more criteria: being powerful enough (being searched by a lot of people), having quite a low or at least a decent competition (not competing with huge, heavily optimized sites) and being relevant with the site theme.

Keyword stuffing – The keyword stuffing is a black hat SEO tactic that consists in spamming a page with some keywords, with the goal to reach a very high keyword density. It was one of the most efficient black hat SEO tactics in the past, but it has no real effect nowadays.

Keyword-rich – A keyword-rich page is a page with quite a lot of content and a good keyword density (between 2% and 8%). The keyword-rich pages are most likely to rank on top of search engine results.