Backlinks: 

A backlink is a link created when one website links to another. Backlinks are also called "inbound links" or "incoming links." When you get down to it, there are only two types of backlinks: dofollow and nofollow. A person reading a web page will never see the difference between a dofollow and a nofollow backlink. The difference is in the source code. There’s a specific tag in the source code that determines how Google and the other search engines view the backlink, which also determines the effect of that backlink on your SEO profile.

1. dofollow Backlinks: Dofollow backlinks are the most common and valuable type of backlink for SEO. When you put a dofollow link on your website, you’re telling Google that the link is organic — as in, the target website didn’t buy the link—and that you’re vouching for the accuracy of the content at the other end of that link.
2. nofollow  Backlinks: Nofollow backlinks are less common. They’re also less valuable. They’re used to tell search engines to ignore a particular link. The percentage of dofollow versus nofollow links that a website has will vary. Google wants to see a good mix of both for a healthy link profile. The biggest difference between these two types of links is that Google places a lot of value on dofollow links — which means they’re great for SEO. Nofollow links, on the other hand, are ignored by Google’s algorithm in most cases. That means they’re rarely valuable for SEO. Surprisingly, nofollow backlinks do provide some SEO value.

Backlinks Portfolio we Build [based on the plan] 

• Backlinks in business profiles | Local Citations or Listings: Creating digital profiles for your brand on business listing sites, social media, industry directories, and review sites most often comes with the opportunity to post a backlink (or a few). Search engines view these entries as evidence that a site is well established

• Backlinks derived from press releases (on topics worthy of media interest) | Press Releases: When your brand has a newsworthy announcement to make, putting out a press release can serve as a foundation for your PR and marketing tactics, while also producing backlinks from publications that cover the announcement and the published release itself.

• Guest blogging backlinks | Guest Post Submissions: When providing well-established sites with guest posts, it’s often possible to include an editorial backlink to your own site. Practicing guest blogging outreach to solicit valuable sites for these opportunities should be a key piece of just about any SEO strategy.
  

• Website Bookmark | Social Bookmarking: Social bookmarking is an online service which allows users to add, annotate, edit, and share bookmarks of web documents. Social bookmarking is a way for people to store, organize, search, and manage “bookmarks” of web pages. Users save links to web pages that they like or want to share, using a social bookmarking site to store these links.
  

• Directory links | Premium  Directories: Creating profiles in directories that are trustworthy and respected. Directory links refer to links that originate in a web directory – also called link directories – that act as list or catalogs of websites. 
  

• Video Sharing | Video Submission: Videos are viral in nature and can really help you in acquiring quality backlinks. Anyway, once you submit your videos to these sites, you can also get a backlink from your video to your website. Video Submission is a process of submitting videos in video submission sites to get quality backlinks. Also, Video submission sites are very effective for increasing brand awareness as well as promoting a brand.