What does esoteric mean?

The term "esoteric" specifically refers to knowledge, concepts, or information that is intended for or likely to be understood by only a small number of people with specialized knowledge or interests. This aligns perfectly with the answer indicating that it is "known only by a few." Esoteric subjects often require a certain level of expertise or background to grasp fully, making them inaccessible to the general public.

In contrast, the other options suggest meanings that are opposite to the core definition of "esoteric." For instance, being "widely known and understood" or "accessible to everyone" suggests an openness and clarity that esoteric concepts lack. Similarly, the idea of being "simple to comprehend" implies a straightforwardness that does not apply to esoteric knowledge, which is often complex and nuanced. Therefore, the distinction lies in the exclusivity and depth of understanding required for esoteric topics, reinforcing that the correct choice accurately captures the term's essence.