Backlink is just a way to promote your site and to get your site ranked higher.
I'll explain what backlink is.
Backlink is just your site on another site.
You can ask to websites to become affiliates so you exchange your links.
This is called backlink.
Also, Have a look at:
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Definition of a backlink:
link at another site, leading to your site. Also called an incoming link. The number and quality of backlinks represent the most important ...
A link from a first page to a second page may be characterized as a backlink from the second page to the first page. A link originating from the second page and leading to the first page may be called an inbound link relative to the first page and indicate that the first page is a linked document.
Backlinks are incoming links (hyperlinks) to a website. Backlinks are often used as part of a
SEO (search engine optimisation) strategy – search engines use the number of backlinks a site has as a measure of its popularity. Opinion differs though on how important backlinks are.
All the links pointing at a particular web page. Inbound linksare an important part of web site marketing as they can deliver targeted visitors directly from another web site, and can help to improve the ranking position of your site on engines that use link popularity as a part of their ...
Backlinks are incoming links to a website or web page. The number of backlinks is an indication of the popularity or importance of that website or page. ...
Code:
Backlinks (or back-links (UK)) are incoming
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to a
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or
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. The number of backlinks is an indication of the popularity or importance of that website or page. In basic link terminology, a backlink is any link received by a web node (web page, directory, website, or
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) from another web node (Björneborn and Ingwersen, 2004). Backlinks are also known as incoming links, inbound links, inlinks, and inward links.
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often use the number of backlinks that a website has as one of the factors for determining that website's search engine ranking. Websites often employ various techniques (called
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) to increase the number of backlinks pointing to their website.
There are various factors for determining the quality of a back link. Main factor is the page rank of the web page giving the back link. Back link from high ranked site is of good quality. Second factor is the subject of the pages which are linked by a back link. If both sites are discussing the same topic, the back link is relevant and of good quality. Third important thing is the anchor text of the back link. If the anchor text is related to the theme of the website (where the link is pointing), then it is called a good quality back link. A good quality back link will increase the page rank of your website.
Wanna check if someone is linking you back?
backlinker:
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how to build backlink? 
