Step 1: Understand the question.
We must choose the correct meaning of phishing.
Step 2: What phishing is.
Phishing is a cybercrime trick. Attackers pretend to be someone you trust to fool you into giving secret information.
Step 3: How it works.
Criminals send fake emails, fake messages, or fake login pages that look real. They hope you type your password or bank details there.
Step 4: What they steal.
Through these fake traps they try to grab passwords, card numbers, OTPs, and personal data.
Step 5: Reject the wrong options.
Backup emails, data reduction, and data hiding are different ideas and have nothing to do with tricking people. Only the fake email idea fits.
Step 6: Conclude.
So phishing means fake emails to steal data, which is option 1.
\[ \boxed{\text{Fake emails to steal data}} \]