This is used to "break out" of a predefined search box, telling the database, "Stop looking for the keyword and start listening to my new command."
These are "comment" markers. They tell the computer to ignore everything else in the original code, effectively silencing any security alarms that were supposed to follow. The "Little Bobby Tables" Legacy
It’s a reminder that in the world of code, A single stray apostrophe can be the difference between a simple search and a total system takeover.