text: Limits to infinity can give you the upper or lower bound of a function.  In other words they can give you a horizontal asymptote for the graph of a function.  It will tell you that a quantity will get no higher (or lower) than this value.\n\nAlso, limits to infinity are used to compute infinite integrals.  An amazing example is the area between the graph of y = e^(-x) from x=0 to infinity and the x-axis.  You might think that the area is infinite since the x values go from 0 to infinity, but actually the answer is 1 sq. unit.