What is the Wayback Machine?

Have you ever seen this on your computer?

That is the Wayback Machine!

Here's a example of using it:

Your teacher asks you to get the oldest version of the PBS Kids website. But you don't know how! So, you type in https://pbskids.org into the first text box, go to it from October 13, 1999, and there! Slideshow below: (P.S. I can't get to it from then)

• 

• 

• 

Now, where is the Wayback Machine? It's at web.archive.org!