Hello again.

I just started a chapter on Exponential Functions and am working on their graphs. I've come across a statement that has me confused. The statement is:

"The exponential function f(x)=a^x ( a>0, a doesn't equal 1 ) has domain R and range ( 0, infinity ). The line y=0 ( the x-axis ) is a horizontal asymptote of f...."

I understand the concept of domain and range. But usually range took the form of y | y > 9 ( y where y is greater than 9 ) [just an example]. I have no idea what range of ( 0, infinity ) means. I thought range was the possible range of values the function/expression/etc would produce, as in a value, not a coordinate pair.