A link directory can be used for search engine optimization
Link directories are a method of SEO

Link directories are a method of search engine optimization (SEO) that can be used in a number of ways:
Link Building: You can join a link directory and build external links to your website. This can improve your site’s search engine rankings, as engines evaluate the quality and quantity of external links.
Increase traffic: Link directories can have a large number of visitors who search for specific topics or categories. If your site is listed in a relevant directory, you may receive more targeted traffic from users who are interested in your content.
Anchor Text Optimization: Search engines use the anchor text of a link to understand the content of the linked page. By choosing descriptive anchor text when submitting to a directory, you can help search engines understand your site’s content and improve your rankings.
However, it is important to choose your link directories carefully. Some directories may be of low quality or considered spam by search engines. By choosing reliable and relevant link directories, you can reap the benefits of search engine optimization.