-1" OR 5*5=25 or "WzXAvhBK"="

That looks like a basic SQL injection payload. It’s trying to break out of a string and inject a tautology to influence the WHERE clause.

Quick breakdown:

• 55=25 is true, so an OR 55=25 can turn a fragile query into something that always evaluates to true (a tautology) if the input isn’t properly sanitized.
• -1" seems like an attempt to terminate a preceding string literal and inject more SQL; whether this succeeds depends on how the input is embedded in the query and how quotes are escaped.
• "WzXAvhBK"="" compares a non-empty string to the empty string; that part would typically be false.

In short: as a payload, it’s designed to exploit weak input handling to make conditions always true, potentially bypassing some checks or returning more data than intended. It’s not a valid, safe input by itself; its effect depends on the surrounding code and database.

Defensive/educational notes:

• Use parameterized queries (prepared statements) with bound parameters, never string-concatenate user input into SQL.
• Validate and sanitize inputs (allow lists, length checks, escaping as needed).
• Use ORM or database APIs that automatically parameterize.
• Apply least-privilege database user accounts.
• Implement proper error handling and avoid leaking database errors to users.
• Consider input normalization and escaping depending on the DBMS and language.

If you want, I can give you a safe, exam-style example of identifying a vulnerability and how to fix it (with code in a language you’re studying).