: This represents a legitimate search term or data field (like a username or product ID) that the web application expects to receive.
When a web application is not properly secured, it might take this text and insert it directly into a database query. For example: {KEYWORD} AND 4477=4477
: If a site responds to this string, it means it is not "sanitizing" user input, leaving it open to a full-scale data breach. : This represents a legitimate search term or