Internal cross linking basically refers to how you link content across various pages within your own website. Internal cross linking is considered as one of the key to helping users quickly and easily navigates through your website to related content topics.
It is fairly easy to integrate internal cross linking when building a new website, but if your site is already established, it will just require some more time consuming work to edit a couple of words on various pages and include some links in them. While there are many forms of navigational links available, the best for SEO purposes remains the plain text link (and obviously should be anchor text links). They can be made to blend in with most simple websites. Text-based links will also help pass some Page Rank value between your pages, so they are well worth considering.
In some situations, adding text links to a website might make it even more search-engine friendly. Actually, a site needs more than a single set of text links to make it more search-engine friendly. In addition to a spider-friendly navigation scheme, all Web developers should know how to cross-link Web pages with related content if they want their website to be more user friendly and obviously more search engine friendly as well.
One way to cross-link related pages is to consider each page's calls-to-action. Balancing primary and secondary calls-to-action can be quite difficult and tricky. If site visitors feel forced into taking a desired call-to-action too quickly, they will most likely leave the site too quickly. People will not "Add to cart" or "Subscribe" or do any valuable action without understanding the clear benefits of taking the call-to action.
On the other hand, if site visitors are not encouraged to take a desired call-to-action on key pages throughout a site, then Website owners might also lose sales and conversions, so be careful.

Finally, internal cross linking serves two functions. The First is that, internal cross-linking communicates to both search engines and site visitors that you consider content to be important.
Second, internal cross linking also provides alternative calls-to-action in the event site visitors are not yet ready to make a purchase.
But remember that by doing internal cross linking, your goal is to help users first, not build a spammy internal link network just because you think the search engines will like it. A human visitor should always come first!

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