Netflix, once a simple mail-order DVD company, is making a huge move. It plans to buy Warner Bros, the legendary studio behind classics like Casablanca, Harry Potter, DC superheroes, and The Lord of the Rings. Warner Bros also owns HBO and timeless movies such as The Wizard of Oz. The deal is valued at about $82.7 billion. This deal is a milestone for Netflix and the entertainment world. For the first time, a company that started by mailing DVDs will own a century-old film library that helped build modern Hollywood.