Is Keyword Difficulty an absolute measure, or relative to my site?

[BrunoReis]

We were able to rank very well for a specific keyword. After signing seomoz I've figured out that this keyword has a difficulty of 1%. All the other similar keywords I've researched have difficulties greater than 20%.

Is the Difficulty related to my site? Or is it absolute?

[mytouchoftech]

Sounds like that keyword is just very specific and there won't be much competition for it.

[BrunoReis]

Thanks, but these keywords ("concurso tst 2012") have 1% for more than a week today.

[EGOL]

Sometimes the keyword difficulty report omits some data.  I would try again tomorrow and you might see different results.

[BrunoReis]

Thanks a lot.

But, why this keywords are so easy still a mystery to me. Is there any reason for a keyword that has some competition around it to have a 1% difficulty?

[EGOL]

It is absolute and has nothing to do with your site.

And, because it is absolute, some sites will be able to achieve top rankings by simply adding a page that is optimized for that keyword and linking to it... but that same page placed on your site might not rank in the top 50 positions.  And that happens because their domain is stronger than yours or even if it has a lot of related content and you do not.