It may be a snippet from a Content Management System (CMS) or a script designed to dynamically insert a download link.
If you received this in an unexpected email or on a suspicious website, do not click any links associated with it, as it is a common tactic for spreading malware. KEYWORD [your_file_ready_to_download]
Because it uses generic "KEYWORD" brackets, it is often a sign of a low-quality spam template where the sender forgot to fill in the actual file name. It may be a snippet from a Content