What is DA?
DA stands for Domain Authority and is a ranking metric that predicts how well a site will rank. It’s one of the industry standards used when we talk about Search Engine Optimization and ranking on the Search Engines.
DA is measured on a scale of 1 to 100. The closer you are to 100, the more traffic you’re likely to have. A backlink from a site such as Amazon can help to increase your own site’s DA and your ranking in search engines such as Google. This can then result in more traffic.
Can I see a sample link?
Sure, here is an example of an existing link to give you an idea: https://www.amazon.com/Tsouaq-com-Evaluate-the-best-products/dp/B07S2QXHSV/
You can see the dofollow link under 'Developer Info', in the bottom-left (on desktop), as in this image: https://imgur.com/a/IejLeHR