The Italian Serie D, also known as the Campionato Nazionale Dilettanti, is the fourth-highest division in the Italian football league system. It was established in 1948 and is organized by the Italian Football Federation. Serie D consists of nine regional divisions, each with varying numbers of teams. The league has a rich history, with several notable teams having competed in the past, including Juventus, Inter Milan, and Napoli. However, these teams have since moved up to higher divisions. Interestingly, Serie D is the only league in Italy that is not fully professional, as it includes both professional and amateur clubs.