difference between c-string and character array?

I've got a test tomorrow and I can't find the answer in a clear form could you tell em if I'm right?

a cstring means a null-terminating char array, right? So that one will have \0 at the end to terminate the array, whereas a character array doesn't have a null terminator, and as such wont work with the built in functiongs for ntca's, such as strlen, strcpy, etc?
I guess I'm just trying to figure out if by c-string they just mean a string? and by character array they mean ntca?
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