Casterbridge is a fictional town created by author Thomas Hardy in his novel "The Mayor of Casterbridge." Set in the 19th century, it reflects the social and economic changes of rural England during that time. The town is characterized by its agricultural background and the struggles of its inhabitants. The story revolves around the life of Michael Henchard, a man who rises to prominence as the mayor but faces personal and moral challenges. Casterbridge serves as a backdrop for themes of fate, regret, and the impact of choices on one's life and relationships.