It’s a Wonderful Life is a classic Christmas movie released in 1946, directed by Frank Capra. It tells the story of a man who is shown what life would have been like if he never existed and learns the true value of his life.
The film title on the poster is likely hand-lettered, and no exact font match has been found. The closest font resemblance is Sexsmith, a Clarendon-style font designed by Ray Larabie, which can be downloaded for free from the Fonts Used Section. You can also purchase Beatnik Barbie by Alex Kaczun, which has a similar bouncy style.