What is the difference between java and core java?

Question

When looking at job openings on-line, I noticed that some openings required knowledge of \"core Java\". What is core java and how is different from java?

Answer 1

I think when you see the phrase "core Java," they are talking about the basics of the language and maybe some knowledge of Java SE. I don't know why they would bother to put the "core" on there.