Which word describes information that is only understandable by a select group?

The term "esoteric" is used to describe information that is intended for or likely to be understood only by a small number of people with specialized knowledge or interests. It often pertains to subjects that are obscure, complex, or require specific insight that the general public might not possess. In academic or niche fields, for example, certain theories, jargon, or philosophies may only be truly appreciated by those deeply engaged in the subject matter.

The other options do not capture this nuance. "Public" refers to information that is accessible and understandable by everyone. "Obvious" signifies something that is easily perceived or understood without much expertise. "Common" indicates something that is widespread or usual, again suggesting broad accessibility rather than select comprehension. Thus, "esoteric" best conveys the idea of information that is limited to a particular audience, often characterized by depth and complexity that can alienate those outside that select group.