The Link launch subtype requires sellers to provide a link to their product. This option does not always increase keyword relevancy but it does drive traffic and increase sales velocity/BSR which help with organic reach.
Although this option will default to your direct product link, you can edit the link if you feel it's necessary.
When to use a link launch:
You want to increase traffic and improve BSR.
Your product is not indexing on the first 7 pages of the search for your desired keywords.
You're concerned about buyers not being able to find your product.
You prefer to use a special link of your choice. For example, some users send buyers to a social media post that then leads to their product listing.
This launch type can be used for brand-new or mature products.