5161=2181-- Qoyo | {keyword} And

: This is a SQL comment marker (in MySQL, PostgreSQL, etc.). It instructs the database engine to ignore everything that follows it in the query.

If you are running a , a bug bounty program , or testing your own code , I can provide specific examples of: How to prevent this using prepared statements. What to look for in a WAF (Web Application Firewall) log. {KEYWORD} AND 5161=2181-- qoyo

This is a basic attempt to see if security measures are in place. : This is a SQL comment marker (in MySQL, PostgreSQL, etc

The attacker adds this to a URL parameter or input field (e.g., ?id=1' AND 5161=2181-- qoyo ). Boolean Logic Test: What to look for in a WAF (Web Application Firewall) log

: A junk string used as a filler to complete the SQL syntax structure. Purpose of this Payload

If the page breaks, returns an error, or shows no content, it confirms that the application is vulnerable to SQL injection because the AND False successfully changed the query's behavior.

If the page loads normally (the same as the original, legitimate query), it tells the attacker that the query is being evaluated, but the AND False didn't change the outcome.