A deep link is when you link to a page on the site other than the site’s home page. For example, Google.com is the homepage of Google. Linking to Google.com/trends would be a deep link.
Deep linking is linking to the specific interior page or product on a website. Simply it link. Deep linking allows visitors to go directly to the information they require.
A deep link is a hypertext link which can be of all the inner pages of the website rather than only home page.We do deep linking to get more back links from a single site.
When it comes to deep linking, the very important part of it is the canonical url address wherein the issue if you do link build with a slash at the end or without slash.