BackLink for a given web resource is a link from some other website (the referrer) to that web resource (the referent).A web resource may be (for example) a website, web page, or web directory. Backlink is important for SEO as it helps to get you ranking in the Google Page, it helps in improving Domain Authority, Page Ranking to show your website in result of GOOGLE page one whenever someone types the given keyword in the google search engine.

1. Link Juice: When a webpage links to any of your articles or your websites homepage, it passes link juice. This link juice helps with the ranking of the article, and also improves the domain authority. As a blogger, you can stop passing link juice by using a no-follow tag.
2. No-Follow Link: When a website links to another website, but the link has a no-follow tag, that link does not pass link juice. No-follow links are not useful concerning the ranking of a page as they do not contribute anything. In general, a webmaster uses the no-follow tag when he/she is linking out to an unreliable site. Example: Links from comments on other blogs.
3. Do-Follow Link: By default, all the links that you add into a blog post are do-follow links, and these pass link juice. Linking Root Domains: This refers to the number of backlinks coming into your website from a unique domain. Even if a website has linked to your website ten times, it will only be considered as one linked root domain.
4. Low-Quality Links: Low-quality links are links that come from harvested sites, automated sites, spam sites, or even porn sites. Such links do far more harm than good. This is one reason you should be careful when buying backlinks. Internal Links: Links that are going from one page to another within the same domain are called internal links. The process itself is referred to as internal linking or interlinking.
5. Anchor Text: Text that is used for hyperlinks is called anchor text. Anchor text backlinks work great when you are trying to rank for particular keywords.

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Hey Swati, 

I am happy that you want to learn SEO from this community.

What is Backlink?

Backlink is an incoming hyperlink may be anchor text link (Online Project Management Tools) or plain link (http://findnerd.com/) from one web page to another website. 

What is SEO:

SEO implies website improvement and it is the procedure of improving rank of your website pages in search engine result Page(SERP).

Now comes the SEO part.We can break the SEO(Search engine optimization ) into two categories:

• On-Page SEO:  On-Page SEO deals with own Website or Web Pages. The changes or updates done only on Website or Web Page to rank well in various SERPs (Search Engine Result Page) search engines like Google, Yahoo, Bing etc.  To learn more On-Page, Read my blog How to Do a Perfect On-Page SEO of Your Website 


• OFF-Page SEO: It deals with external link-building (building link from other sites)

Baclinks from authority sites are the most vital factor to add reputation to your site for major search engines.

You can explore for latest link building(backlink) methods:

• How to do Link building for your site

• Link Building Tactics You Need to Know in 2016

For more information, Contact me on Twitter: @iHarishPal

A backlink is one of the most common term used in the world of search engine optimization. Backlinks are the incoming links to a webpage. When a webpage links to any other page, its called a backlink.

Some importance of the backlinks:

1. Improves Organic Ranking
2. Faster Indexing
3. Referral Traffic

How can you get more backlinks?

Below are some helpfull points to increase the backlinks for your website:

1. Participate in web-master forums.
2. Write amazingly informative posts.
3. Info-graphic
4. Promote your website/blog in high DA websites
5. Guest posting

I hope answer will satisfy your query. Thanks :)

Simply, a backlink means linking your website with other website .when we click on the back link it redirect to the linked site.It helps in increasing organic search results the more backlinks you have the more traffic you get to your website.autometically your ranks improve. How to get back links... 1.Outreach 2.Guest post 3.Paid websites. Outreach is an effort to connect your idea with the others (similar ideas).it is generally done through Infographic and guest post.it is individual effort( man to man)by which you can exchange backlinks. Other way is paid website they charge for the backlinks in their bolgs.