Brexit, the United Kingdom's decision to leave the European Union, is one of the most consequential events in modern European history. The term, derived from "British exit," encapsulates not just a political decision but a significant shift in governance, identity, and global relationships. This momentous choice followed decades of debate over the UK's role within the European project and culminated in the 2016 referendum, where a slim majority of voters chose to leave the EU after more than four decades of membership. 

For many supporters, Brexit symbolized a reclamation of sovereignty. They believed that leaving the EU would restore the UK's ability to independently manage its borders, laws, and economic policies. Critics, however, warned of the economic, political, and social risks associated with exiting such an interconnected union. The campaign and its aftermath highlighted divisions within British society\u2014geographical, generational, and ideological\u2014that have defined the national conversation ever since. 

The journey from referendum to departure was marked by profound challenges. The complexities of untangling years of shared policies, trade agreements, and legal frameworks became evident as negotiations unfolded. Key issues, such as citizens' rights, future trade relationships, and the Irish border, underscored the depth of the UK's integration with the EU and the difficulties inherent in leaving. Political turmoil further complicated the process, with successive governments struggling to reconcile domestic and international pressures.