France is divided into 101 administrative divisions known as departments. Each department is assigned a unique two-digit number, which is used in postal codes and vehicle registration. The departments are grouped into regions, and they play a crucial role in local governance, providing services such as education, transportation, and public safety. The departments were created during the French Revolution in 1790 to replace the old provinces and promote equality. Each department has a prefect appointed by the national government, who oversees its administration. The capital of each department is typically the largest city within its boundaries, serving as the administrative center.