JK Rowling got the idea for Harry Potter in 1990. The first book - Harry Potter and the Philosopher's Stone - was rejected by lots of publishers before being snapped up.
The first Potter novel finally came out in 1997. JK's real name is Joanne, but she was known as JK to keep readers guessing about whether she was a man or a woman.
Potter was a HIT! It was being talked about in playgrounds across the country. In 1998, the first book came in America, where it was re-named Harry Potter and the Sorcerer's Stone.
Many people couldn't wait for the next instalment of the adventures of Harry and his mates Ron and Hermione. Harry Potter and the Chamber Of Secrets hit the shops in 1998.
It was full steam ahead on the Hogwarts Express as the fourth instalment - Harry Potter and the Goblet Of Fire - steamed into bookshops in 2000. JK Rowling was a superstar!
The third book, Harry Potter and the Prisoner Of Azkaban, came out in 1999. Adults were as keen as kids to find out the latest from Hogwarts School of Witchcraft and Wizardry!
In 2001, Potter hit the big screen. Philosopher's Stone came out as a movie, with Dan Radcliffe in the title role. Rupert Grint and Emma Watson were cast as Ron and Hermione.
Fans had to wait until 2003 for the fifth book - Order Of The Phoenix. But, in the meantime, they got to see the movie of Chamber Of Secrets - complete with flying car!
In 2004, the Prisoner Of Azkaban movie came out. In 2005, book six - Harry Potter and the Half-Blood Prince - was published AND the fourth film - Goblet Of Fire - hit the screen.
In the countdown to the release of the final book Deathly Hallows, it was announced a Potter-themed adventure park was going to open in America in 2009.
In 2007, film five - Order Of The Phoenix - came out. Weeks later, the Potter series came to a close with the release of the seventh and final book, Deathly Hallows.
The final book in the series went on sale around the world at midnight on Saturday 21 July. Millions of people finally found out how Harry's adventures ended.
For some very lucky children in London JK Rowling gave a reading from the final book, Harry Potter and the Deathly Hallows, at the Natural History Museum in London.