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.

: A junk string used as a filler to complete the SQL syntax structure. Purpose of this Payload {KEYWORD} AND 5161=2181-- qoyo

: This is a Boolean statement. The server evaluates this as False because 5161 does not equal 2181. : This is a SQL comment marker (in MySQL, PostgreSQL, etc