If you're dealing with plain vanilla functions that are continuous, if you evaluate at x equals a, and you get a real number, that's probably going to be the limit. But now let's think about the other scenarios. What happens if you evaluate it, and you get some number divided by zero? Well, that case, you are probably dealing with a vertical asymptote. And what do we mean by a vertical asymptote? Well, look at this example right over here, where you're just saying the limit, we'll do that in a darker color. So if we're talking about the limit as x approaches one, of one over x minus one.