(1) Between -1 and 1, the graph is the line y = x; i.e. at 45 degrees to the axes between (-1,-1) and (1, 1), excluding (-1, -1), but including (1, 1). This covers a range of values of x of length 2, the period of the function. So this line segment is repeated between x = 1 and x = 3, and again, and again, ... Also to the left between x = -3 and x = -1, etc... See sketch.
(2) Assuming is real, the domain is all the real numbers.
If which is for .
So the range is all the non-negative reals.