Digital Asset
A digital asset is anything published with a stable identity (a canonical URL, a typed record, a clear place in a taxonomy) that gets more valuable the more the surrounding ecosystem references it. A directory listing, a glossary term, and a well-structured domain are all digital assets. A one-off promotional blog post usually is not.
The distinguishing test is durability: does the thing still pay dividends a year after it was published, or did it stop mattering the day the campaign ended?
In Practice
The Directory entry for a trade school on this site is a digital asset: every article that links to it, every glossary term that references it, and every constellation page that lists it adds to its value. An article announcing a one-time promotion is content; it does its job once.
Worth Knowing
Content and assets are not opposites in practice — most good content is built on top of an asset and points back to it. The mistake is building only content, with no underlying structure for it to compound against.