Please tell me how back links helps and what is the exact defination of it?

Back links are the link to your website at other directories. back links can be increase through article writing, directory submission, forum posting and blog commenting.

Search engine optimization, the use of various techniques to improve a web site's ranking in the search engines and thus attract more visitors

SEO is the process of getting your site ranked high in the search engines through both on and off page SEO. Although on-page SEO can act as a bonus to your rankings, it is the off-page SEO that will get you to the top of the search engines. Also, known as link-building.

Backlinks are the links which you place on other sites through article submissions, forum posting and many others.

Backlinks are just like to make more n more people know about your website. Search engines give rank to the websites which are more popular. Popular websites with strong backlinks are very beneficial...

Backlinks are links which are pointing to your site from other website & it helps in link building thereby making a good keyword place in search engine rankings.

Back links are very important to your website that play a major role in seo and can help you to increase your website rankings in search engine.

Backlinks are the links on other websites or pages, that lead back to your website.