Why use C++ container "array" rather than traditional C array?

Popular opinion is that C++ array is safer with almost equal efficiency. Except for checking whether the index is out of range and not allowing implicit type cast to pointer, are there any other features?

Besides, why implicit type cast of traditional C array is regarded as a bad way?

I'm not very good at C++(also at English),plz forgive me if this question is not worth an answer. Thank you!