How much important is the connection between content and backlink relevancy?

[shaz_lhr]

My question is about the connection between web page content and backlink relevancy, how much it is important?

Let’s have an example:

If I publish a guest post about “cell phone model review” and get a link back to my website which is on the subject of “cell phone monitoring”.

Now my question is:

Is this a relevant and good quality backlink? As content is about “cell phone Model Review” while the backlink is about “cell phone Monitoring”, How Google would take this as if;

1- Anchor text is “cell phone monitoring”

2- Anchor text is URL based

[TakeshiYoung]

Google uses some complex algorithms to determine topical relevance, so I don't think anyone can tell you exactly which keywords Google thinks are related (although things like the Adwords tool and search suggest can provide hints).

Your example seems pretty relevant though, given that both sites are both about cell phones.  Even if a site is not relevant, it can still pass valuable link juice, as long as it's not done in a spammy manner.  My advice is not to stress over a single backlink and work on a strategy for building lots of links from both relevant and non-relevant sources.