A more thorough explanation:

Definition: An impostor is someone who pretends to be someone else in order to deceive others and gain benefits that they are not entitled to. The term is also spelled as "imposter".

• A person who pretends to be a doctor and gives medical advice without proper qualifications is an impostor.
• Someone who uses a fake identity to access someone else's bank account is also an impostor.
• A person who claims to be a celebrity and tries to get special treatment or access to events is an impostor.

These examples illustrate how an impostor can use deception to gain an advantage or benefit that they are not entitled to. It is important to be cautious and verify someone's identity before trusting them or giving them access to sensitive information or resources.