A static link is a hard-coded link containing a Web page uniform resource locator (URL) that is permanent or unchangeable. It is the opposite of dynamic link. As a static link is permanent in nature, search engines find such links to be easier to crawl and index, which greatly helps in search engine optimization (SEO).
Techopedia explains Static Link
The likelihood of readers/users clicking a static link is usually high compared to that of a dynamic link. The reason for the higher click-through rate is that, often, the static link is relevant to the context of the keywords presented. This makes the use of static links more preferable in cases such as branding as well as advertising. Also, the permanent nature of a static link makes it easier for readers to forward the link information, save it to a file or use it offline. In addition, static links are easy to copy and paste.
Static links can be used by a website to achieve a high page rank by anchoring the keyword-rich text. In the case of multiple parameters, search engines find it easier to handle static links than dynamic links.
One distinct disadvantage of using a static link is the amount of rewriting involved in case search engines, or users find it cumbersome to locate the proper content relevant to the context in a website. Also, the stability of the page referred by a static link should not fluctuate.