The WABAC machine is a fictional time-travel device from the animated television series, "The Adventures of Rocky and Bullwinkle." It allows characters to travel back in time to witness historical events or interact with famous figures. The name "WABAC" is a playful acronym for "Wayback," emphasizing its purpose of exploring the past. In the show, the WABAC machine is operated by the character Mr. Peabody, a highly intelligent dog. He uses the machine to teach his young friend, Sherman, about history in a fun and engaging way. The WABAC machine has become a cultural reference for time travel and nostalgia.