linkless feature of the link building
 

what is the linkless feature of the link building

Google has used links to determine the authority of websites since its early days: the idea of webpages casting “votes” for other pages by linking to them is at the core of the PageRank algorithm.

Link building is the process of acquiring hyperlinks from other websites to your own. A hyperlink (usually just called a link) is a way for users to navigate between pages on the internet.
Search engines use links to crawl the web; they will crawl the links between the individual pages on your website, and they will crawl the links between entire websites. There are many techniques for building links, and while they vary in difficulty, SEOs tend to agree that link building is one of the hardest parts of their jobs.

how that is possible it will be no link then it will be not a backlink.