Dom Cobb is the main character in the film Inception, directed by Christopher Nolan. He is a skilled thief who specializes in extracting secrets from people's subconscious while they dream. Cobb is haunted by his past and struggles with the loss of his wife, which complicates his ability to perform his job effectively. Throughout the film, Cobb is offered a chance to have his criminal history erased if he can successfully perform inception—the act of planting an idea in someone's mind. His journey explores themes of reality, memory, and the power of dreams, making him a complex and relatable character.