Imagine this. You are an owner of a large e-commerce site. It is Black Friday, the biggest online promotion that you have, and you are eager to see how the site is going on. You type your domain name into your browser and… “Oh no!” “It is not opening. This is a disaster!” What is going on! You are experiencing a DNS outage that might completely devastate your promotion!
So, what is this DNS outage?
DNS outage is the time when your DNS is not functioning for some reason (your nameservers were attacked, or they were saturated with too strong traffic, etc.), and that does not allow the domain resolution of your domain name to its IP address. The DNS resolution is the first step to enter a site. The browser won’t know where your website is hosted without it, and it can’t find its content.