What does the term 'obscure' mean?

The term 'obscure' refers to something that is not well-known or is not easily understood. It signifies a sense of ambiguity or a lack of clarity surrounding a subject, concept, or piece of information. When something is described as 'obscure,' it often means that it is hidden from view, requires special knowledge or insight to comprehend, or is not readily accessible to the average person. In contrast, the other options define attributes of clarity, recognition, or widespread awareness, which are directly opposite to the meaning of 'obscure.' Therefore, the selection that captures the essence of being not known or difficult to understand is the most fitting choice.