Backlinks are links that are stored on other sites go to your site or blog belong to us. For example there is a link www.videolan.org on your site. Means that this blog has a backlink from your blog, as well as vice versa.
This is one of the SEO techniques that you need to know because more backlinks the more important of our site in search engines especially google.

Backlink benefits actually being clear in the first paragraph, but I clarify again that is a measure of the level of trust in the eyes of search engines because more and more backlinks the more likely to increase page rank, the higher the page rank (1-10 scale) the more important. (Please note page rank is not always directly proportional to improve SERP)

Now how do you know the number of backlinks leading to our blog?
There are many sites that provide facilities to determine the number of backlinks, The first was of course Google itself, the way he went to google.com to stay type “link: blogsname.com” example “www.videolan.org” without the quotes.

Other sites are:
www.linkvendor.com
www.backlinkwatch.com

You can just type the name of your blog or website to find out the number of backlinks.
Among these sites there are additional advantages and others. For results searches are often quite different among these sites but not too striking. Please your own tests to determine the number of backlinks.

additional Backlink:

Natural Backlink

Natural backlink could be fulfilled if inserted in the content or articles and in sentence form so impressed natural. Most beginners think that to get backlinks is to include links to relevant sites in the sidebar, but it is not appropriate and not optimal.

Text vs. Banner

One more thing to note, that counted as backlinks by search engines is a link in the form of text (or text links), not the link is in the form of banner (banner link).

PageRank* vs SERP**

What exactly is the purpose of gathering backlinks? Increasing PageRank for your site or get a good position in search engines, Both answers are true, but in practice there is little difference in implementation.

* To raise the PageRank, backlinks that we have to:
Derived from sites with similar topics.
Derived from the site of his PageRank higher. But there is no harm in collecting backlink from the site homework to whatever remains will be taken into account for the assessment

** Meanwhile, if our goal is to boost the ranking in search engines, then:
Backlinks can be collected from various sites. But still, priority backlink from Hidden site similar.
Use Natural Backlink.
Backlink should use a variety of targeted keywords in anchor text. Try also to do deep linking or link to other pages on the site concerned.

Source Backlink

The subject of the last, where we can gather backlink ?  Or how to get as many backlinks?

I’ll give you a free list of Highquality PageRank site.
Just download the PDF file :