"Subject Matter Expert" [closed]

In the term "Subject Matter Expert" (SME), what does the qualifier "Subject Matter" mean? Are there experts without subject matter (other than perhaps Irwin Corey, the "World's Foremost Authority")

https://en.wikipedia.org/wiki/Subject-matter_expert

Solution 1:

From the page you reference:

In general, the term is used when developing materials (a book, an examination, a manual, etc.) about a topic, and expertise on the topic is needed by the personnel developing the material.

The reason you might call someone a "subject-matter expert" is to clarify that the person is an expert on this subject matter. A medical doctor can certainly be called an expert, but if he's being quoted in a book about plants, then he's probably not a subject-matter expert.