"Josef K." is the protagonist of Franz Kafka's novel, "The Trial." He is an ordinary man who finds himself unexpectedly arrested by mysterious authorities without being informed of the charges against him. The story explores themes of bureaucracy, guilt, and the absurdity of the legal system. Throughout the novel, Josef K. navigates a surreal and nightmarish world, encountering various characters and situations that highlight his helplessness. His struggle against an opaque judicial system reflects Kafka's critique of modern society and the individual's alienation within it. The narrative is often seen as a representation of existential anxiety.