I heard about the cross linking, but what is the use of it?whether it will be useful for link building?If any of you know about that, kindly share to us.Thanks

Cross linking is good for getting backlinks.

Hi,
Cross links are simple links except that, you control the links between sites and you want them to be relevant between each other, in order to words add value to the visitor of your website. They are very beneficial because providing backlinks for the website.

Cross linking is linking of two or more sites of the same owner. Sometimes the owner feels he can link together all his sites for quick and  effortless link building.

It's okay to crosslink between your websites/blogs as long as the sites being linked are related. Cross linking is beneficial if cross linking is not overdone and:
-Both sites have unique content
-Anchor text is used for cross linking .
-A 'link ring' is not created

Cross linking is applied in terms of linking between two websites together. It means one website linking to the other website, Whether or not they are owned by the same person. The main thing is that if you are the owner of the both site which is linking together it will very effectively for your site. 

For more detail about Cross linking you can check the following link http://www.seomarketingworld.com/seo-faq/cross-linking.php

Cross linking is just a term used to describe linking between domain names. It allows users to reference sites with content similar to that which they are already viewing, and may be of further interest to them.

Understanding Excessive cross linking is difficult. In general if you have a new site then avoid linking structures which try to manipulate PR. A link from a site's page to another of it's page is not cross linking IMHO. Cross linking comes into picture when you have 2 or more sites and you link many pages from your sites to one another.

In simple words you can say that Cross linking refers to the process of linking between two websites.This is often for the purpose of increasing its popularity with search engine.

Cross linking refers to the process of linking between two sites. Cross Linking is when a group of domains that are most often owned by the same individual inner link to each other. This is often for the purpose of increasing its popularity with search engines.

Cross linking refers to the process of linking between two sites. Whether or not they are owned by the same person, cross linking is the process on which the internet is built. Cross linking sites together means that you are putting a link on site A to site B. These sites can be owned by the same person or just related sites wishing to link to each other.

Cross linking also serves an interesting purpose in terms of search engine optimization. Link popularity is one of the main factors involved in how search engines determine the value, importance and relevance of sites on a given topic. This calculation is then reflected in the site's search ranking.

Nice one. You give justice to the description.

Understanding Excessive cross linking is difficult. In general if you have a new site then avoid linking structures which try to manipulate PR. A link from a site's page to another of it's page is not cross linking IMHO. Cross linking comes into picture when you have 2 or more sites and you link many pages from your sites to one another.

Cross Linking is when a group of domains that are most often owned by the same individual inner link to each other. This is often for the purpose of increasing its popularity with search engines. Cross linking is also Interlinking among web pages within the same website hosting.