Daniel was picked from thousands to become Harry Potter.
But after getting the magical role in the summer of 2000 he was still surprised by how famous he suddenly became.
CBBC Newsround's Lizo Mzimba spoke to him before the first film was released in November 2001.
Click here to watch Daniel Radcliffe's interview or scroll down to read it
Were you surprised by how famous you suddenly became?
I knew it was going to be big news but I didn't know it was going to be that bigger news because within 20 minutes of the announcement the press were outside my house, apparently, which was pretty funny.
How did you get on with Emma and Rupert?
We get along really well because we're all quite like our characters and Rupert's very funny, Emma's very intelligent and I'm in between because that's, I think, how Harry is.
And the characters are very compatible, so I think we were - we get on really well and we still do get on really well.
Which was the most difficult scene to do in the movie?
The final chamber one because that is the climax with Voldemord and so yeah that was not so much hard but it was very intense and I had to be focused.
What was it like riding your broomstick and playing Quidditch?
It was cool because everybody's like all whizzing round on the Quidditch broomsticks and everybody in the stands are cheering you, they're very fun scenes to do.
How are you feeling about filming the second Harry Potter adventure - the Chamber of Secrets?
The second book's probably my favourite because it's got this main really dark story line of the whole Basilisk, which I'm really looking forward to killing.
But as well as that really dark story line they've got loads of light story lines, like Gilderoy Lockhart and Colin Creevey and Ginny Weasley and Dobby and again the Quidditch season.