You are online and try to access a specific website. A pop-up comes out with: “Adult content verification”.
In a normal situation, this would be just a “Press OK if you are over 18” button, but the scam is actually asking to put in your password (or sometimes for other personal information). Needless to say, once you give that away, your account is hacked and compromised.
How to avoid: use your judgment; a password doesn’t certify if you are an adult or not.