Are backlinks still important for Rank?

Backlinks are particularly useful for SEO because they represent a "vote of confidence" from one site to another.

Essentially, the backlinks to your website are a signal for the search engines that others are vouching for your content. If many sites refer to the same web page or website, search engines can deduce that the content is worth linking to a link, and thus also surfacing on a SERP. Thus, earning these backlinks can have a positive effect on the ranking or visibility of searches on a site.