As an Entertainer that tries to act, look or sound like a famous person as part of their profession. This can include voice Mimic ry, action mimicry or Reenactment using visual props such as clothing, wigs and accessories.
As part of a Criminal act such as Identity Theft . This is usually where the criminal is trying to assume the Identity of another in order to commit fraud such as accessing confidential information or to gain property not belonging to them.