An external link is a link that points at an external domain. "The external links are the most important source of ranking power.that external links are the most important source of ranking power. External links pass ""link juice"" (ranking power) differently than internal links because the search engines consider them as third-party votes."

Internal links are links that go from one page on a domain to a different page on the same domain.

It's a link to a page of the same website.

it link to a site of same website.

Internal links are those that point to internal webpages of the same root domain. These links are helpful to redirect traffic to various internal pages of your website and reduce the bounce rate.

What is Internal Linking?

Web practitioners from various disciplines may have different terms for this, but I think this is a term that's well understood in the SEO 'community' and beyond.

Broadly speaking, internal linking refers to any links from one page on a domain which lead to another page on that same domain.

This can refer to the main site navigation, like the links you see above this article to our sections on SEO, PPC etc. It also refers to links within articles to related content, such as this link to an article on duplicate content.

For the purpose of this post, I'm mainly going to confine myself to the latter – the editorial links within articles.

This is not to denigrate the importance of the broader site architecture, but more because links within articles are more of a day to day SEO tactic, and they are generally controlled by the site's writers and editors rather than a tech team.