So, there are a lot of ways to waste your time on the internet. Some are fun, some are boring, and some are just weird. This is the latter. Cookie Clicker is not just the title of the game at http://orteil.dashnet.org/experiments/cookie/, it's the entirety of the game.
You just click on it. At first the text at the top of the screen tells you that no one likes your cookies. As you click and presumably make more, this improves and many people like your cookies. That's right, you've just been clicking on a cartoon cookie.
But, rather than do all the hard work yourself, you can spend some of your cookies points on upgrades, like a grannie who will bake extra cookies for you, an auto clicker and more. These upgrades can cost exorbitant amounts of cookies. But what else are you going to spend your fake cookies on if not the portal that opens the door to the Cookieverse?
There is no point. You cannot win (or maybe I am not trying hard enough). But you will waste a lot of time.