Many people think of the internet as something that will always be there. Yes, specific websites may crash or go down from time to time, and it can be frustrating, but the internet as a whole is considered stable. Until Tuesday. That's when a relatively small error led to a major crash taking a huge portion of the internet offline. This has also been fixed -- as evidenced by the fact that you're reading this post -- but it's still important to consider what happened and whether or not such a thing could happen again in the future.