"Catch-22" is a novel written by Joseph Heller and published in 1961. It is widely regarded as one of the greatest works of American literature in the 20th century. The book is set during World War II and follows the experiences of Captain John Yossarian, a U.S. Army Air Forces B-25 bombardier.

The central theme of the book is the absurdity and irrationality of war and military bureaucracy. The title of the book refers to a military rule, Catch-22, which states that a soldier is considered insane if he continues to fly combat missions, but is also considered sane if he asks to be relieved of duty. This catch creates a paradox that Yossarian and other characters are unable to escape, leading to a sense of hopelessness and frustration.

The book is characterized by its dark humor and satire, and it is widely regarded as one of the earliest and greatest examples of anti-war literature. The characters in the book are a diverse group of soldiers and officers, each with their own quirks and motivations, and their interactions and experiences serve to highlight the madness of war and the military system.

Overall, "Catch-22" is a powerful and timeless work that offers a unique perspective on war and the human condition. Its themes of absurdity, desperation, and the struggle for survival continue to resonate with readers today and it remains a must-read for fans of contemporary literature and anyone interested in the human experience of war.