Fake key sites often prompt you to enter your Steam or Battle.net login credentials to "verify" the key. This is a classic phishing attack. Your account will be stripped of any existing games and sold online within minutes.
: If you purchase a physical or digital copy, you receive a code (often in a format like 1AB2C-D3FGH-456I7 ) that you enter directly into the store's "Redeem Code" section.
In reality, these files are almost never what they claim to be. Here is why you should be extremely cautious: