A more thorough explanation:

An all-purpose public figure is a person who has achieved fame or notoriety, or who has voluntarily become involved in a public controversy. This person is considered a public figure for all purposes and in all contexts. They may have achieved such pervasive fame or influence that they are recognizable to the general public, even if they did not actively seek attention.

For example, a celebrity like Beyoncé or a politician like Barack Obama would be considered an all-purpose public figure. They are well-known to the public and have achieved fame or notoriety in various contexts.

In legal terms, a public figure (or public official) suing for defamation must prove that the defendant acted with actual malice. This means that the defendant made a false statement with knowledge that it was false or with reckless disregard for the truth.

Another type of public figure is a limited-purpose public figure. This is a person who has become involved in a particular public issue and has achieved fame or notoriety only in relation to that issue.

For example, a person who speaks out against a controversial political issue and becomes well-known for their stance would be considered a limited-purpose public figure. They are only a public figure in relation to that particular issue.

Overall, the distinction between all-purpose and limited-purpose public figures is important in legal cases involving defamation or libel. It determines the level of proof required to prove that a statement was defamatory.