404
You’re on a website, surfing along the pages, when all of a sudden you look down and see a tortoise. It’s crawling toward you. You ask the tortoise to take you to a webpage.
The tortoise lays there on its back, its belly baking in the hot sun, beating its legs trying to find the webpage you were looking for, but it can’t. Because that page doesn’t exist.
Why doesn’t it exist?
Or, let us know what you were looking for.