What is the difference between '/' and '//' when used for division?

Question

Is there a benefit to using one over the other? In Python 2, they both seem to return the same results:

>>> 6/3
2
>>> 6//3
2

Answer 1

Python 2.x Clarification:

To clarify for the Python 2.x line, / is neither floor division nor true division. The current accepted answer is not clear on this.

/ is floor division when both args are int, but is true division when either or both of the args are float.

The above tells more truth, and is more clear than the 2nd paragraph in the accepted answer.