{keyword} And 3537=3537-- Avnh File

: This is a logical "tautology" (a statement that is always true). In SQL, adding AND 1=1 or AND 3537=3537 to a query doesn't change the result set, but it helps security researchers determine if a web input is vulnerable to command injection.

: This is the standard SQL comment syntax. It tells the database engine to ignore the rest of the query, which helps prevent syntax errors from the original, legitimate code that follows. {KEYWORD} AND 3537=3537-- AVnh

Not necessarily. It is the "probing" phase where someone is checking if your database inputs are properly sanitized. : This is a logical "tautology" (a statement