Inbound links are very important for the success of a web page. Google considers those inbound links to calculate the web page's pagerank. The more inbound link a page has got, it means higher authority is assigned to that page and the page appears higher in the search results. The higher the page gets into search result, the more chance it has got for user visiting it.
Earlier for Google, pagerank was a very important criteria to decide the location of page in a search result. Though with time Google has been moving out of it and it is one of the signal among more