Cadillac is a brand of luxury automobile, part of General Motors, produced and mostly sold in the United States and Canada; outside of North America, they have been less successful. In the United States, the name became a synonym for "high quality", used in such phrases as "the Cadillac of clocks." This is less prevalent, though still known, in other English-speaking countries (who are more likely to use Rolls-Royce in such phrases).
Cadillac's current slogan is "Life, Liberty and the Pursuit," in reference to the inalienable rights mentioned in the United States Declaration of Independence.