A network of low-to-medium quality external websites used to send links to every page of a client's site, primarily as an anti-AI-slop signal to Google rather than as a primary ranking mechanism.
"The first kind of link is a low to medium quality link... generally we use at my agency a PBN. Stands for private blog network... we send them to every single of the 30 pages, the core 30, just as a signal to Google that they're not AI slop."