In web design/marketing, the term evergreen refers to a topic that is always relevant, or content about that topic. A long form blog post/resource page that might be updated as your industry changes and continues to bring traffic long after it’s published would be considered evergreen content. Here’s a great article about evergreen content by AHREFS, which also serves as an example of what evergreen content is. Because this is a valuable, continually relevant article, I’m linking to it. This backlink gives AHREFS’ page (and site) further authority, bringing in yet more traffic.