So Harry and Ron head out of Hagrid's hut and follow the spiders, which are crawling towards the Forbidden Forest.
"Follow the spiders." It's never something adorable like "follow the butterflies" is it, Ron?
The boys walk until they reach a creepy hollow covered in cobwebs. Ron doesn't think going in is the best idea but Harry's pretty gung-ho so they head inside.
In the hollow, they hear a voice and a ginormous spider steps out to talk to them. Harry recognizes him as a much older Aragog.
Harry explains that Hagrid's in trouble and asks what Aragog knows about the Chamber of Secrets.
Aragog tells them that Hagrid didn't open the chamber way back when. That means Aragog isn't the monster from the chamber either. That thing is a creature that spiders fear more than anything. Aragog doesn't specify exactly what that is though.
After that girl was found dead in the bathroom at Hogwarts, Hagrid brought Aragog to the forest for safekeeping. He's been living there ever since.
Well, that was a lot of useful information. Guess talking to this hideously frightening spider actually turned out to be a great idea, right?