It depends on context. The question is like asking "what's the difference between 'x + x' and '5'"; the former is 'code', an algorithm with placeholders for dat

It depends on context. The question is like asking "what's the difference between 'x + x' and '5'"; the former is 'code', an algorithm with placeholders for data; the latter is data. In another context, though, the function 'f(x) = x + x' might itself be data. Within a given context, however, the answer is generally unambiguous: data is what is acted upon by code. (The breaking of this distinction is one of the reasons self modifying code is Bad.)