Definition
A structured, named catalog of the many different ways attackers can smuggle hidden instructions into an AI system to hijack its behavior — now expanded by security vendors to over 200 distinct documented techniques. Having a shared taxonomy lets defenders name and track specific attack variants the way antivirus companies name malware families.
Why it matters
The sheer size of this catalog (200+ techniques and growing) signals that prompt injection isn't a single bug to patch but an entire, rapidly expanding attack category that security teams must continuously monitor.