Wikipedia says that the term personal means "of or pertaining to a person, or belonging to a person in some way", for example: personal hygiene, personal identity, personal web page.
Personal can be a synonym for individual or private. Many topics out in the blogosphere on personal can be on personal privacy (privacy of the individual), personal finance, personal interests, and personal information. Personal information can be of particular interest because it is that which scammers and criminals may try to steal, then use it for criminal means.
No one can forget the personal computer.