This article talks about hyperlinks, because that’s what mainstream audiences understand, but the issue is the internet’s Domain Name System (DNS):

Domain Name System (DNS) servers power every hyperlink. They rapidly translate the text of a dotcom address into numbers that can then pinpoint the root server and map the precise locations of every every web page, every image, video, file — no matter where it is worldwide.

Good DNS services speed up web sites, balance traffic loads and protect against a wide spectrum of cyber threats. Bad DNS makes sites slow and unstable and makes it easy for criminals to change the address of links on a web page to their malware.

Source: ZDNet