Okay, so Cory Doctorow is a person who writes books and articles about how things work on the internet and how it affects our lives. He talks about things like privacy, copyright, and free speech.
Just like how we have rules at home and at school to keep us safe and happy, there are rules on the internet too. But sometimes those rules can be confusing or even unfair.
Cory Doctorow doesn't like when people's rights get taken away, so he writes and talks about it to help people understand what's going on. He wants everyone to be able to use the internet in a safe and fair way.
Think of him like a superhero who fights for what's right on the internet!