Why is the zero of a function the same as the x-intercept of the functiom?

The zero of a function is the x-value that makes the function say f(x)=0. The zero function is the same as x-intercept because it shown the point where the y=0 is zero and by definition the points where y is 0 is called an x-intercept.  

(-8,5) bu tun not sure ok