The contents of the Batman graphic novel collection you're asking about can vary a lot depending on the specific set, but many popular collections bundle foundational stories that trace the character's darker, modern evolution. A typical collection might start with Frank Miller's 'Batman: Year One', which redefined the origin with a gritty, grounded police procedural feel, and then follow it with his iconic 'The Dark Knight Returns', a future-set story of an aged Bruce Wayne returning to a dystopian Gotham. You'd almost certainly find Alan Moore and Brian Bolland's 'Batman: The Killing Joke', a haunting dive into the Joker's possible origin and his brutal assault on the Gordon family, which became a major influence on the character's lore.
Another common inclusion is Jeph Loeb and Tim Sale's 'Batman: The Long Halloween', a brilliant mystery that pits Batman against a serial killer operating on holidays while charting the rise of his classic rogues' gallery and the early days of Harvey Dent. Its sequel, 'Batman: Dark Victory', often pairs with it. Modern collections might also feature 'Batman: Hush' by Jeph Loeb and Jim Lee for its blockbuster, twist-filled plot that involves nearly every major villain, or 'Batman: Court of Owls' by Scott Snyder and Greg Capullo, which introduced a terrifying new secret society woven into Gotham's history.
Some sets round things out with arcs like 'Batman: Knightfall' for the Bane-breaks-the-Bat saga, or 'Batman: Under the Red Hood' for its emotional exploration of Jason Todd's return. The exact lineup defines the collection's theme—whether it's 'greatest hits,' a creator-focused set, or a chronological 'essential Batman' package. I always check the publisher's listing page for the definitive table of contents before buying, as that's the only way to know for sure what's inside that particular hardcover or slipcase.