Which Harry Potter book was released worldwide on 21 July 2007?

Harry Potter and the Deathly Hallows was released worldwide on 21 July 2007.

It is the seventh and final novel in J.K. Rowling’s main Harry Potter series. The simultaneous worldwide release was a major publishing event, with readers in many countries waiting for the conclusion of Harry’s conflict with Lord Voldemort.

The story follows Harry, Ron, and Hermione as they leave Hogwarts and search for objects connected to Voldemort’s immortality. It also develops the legend of the three Deathly Hallows: the Elder Wand, the Resurrection Stone, and the Invisibility Cloak.

The novel was adapted into two films, Harry Potter and the Deathly Hallows – Part 1 and Part 2. This division explains why the film franchise has eight installments even though Rowling’s central story consists of seven novels.