In SEO: do-follow link is a link which gets indexed by search engines while no-follow link is a link which does not gets indexed by search engines. For SEO, do-follow link is recommended.
Unique backlinks are the backlinks that are good for SEO and provides do-follow links and also has high DA. Unique backlinks are also relevant backlinks.
Digital marketing is a type of marketing which is used to promote our business or company with the help of electronic devices. For example, SEO, Social media marketing, SEM, Email marketing, SMS marketing.
SEO articles referred to the articles which are composed according to the rules of search engines and promoting articles using White Hat SEO techniques.