Yes, it is. The story is based on the real - life experiences of the von Trapp family. Maria was a real person who became a governess to the von Trapp children and eventually married the Captain. Their family's escape from Austria during World War II is also part of the true story.
The Sound of Music has roots in a true story. However, it's important to note that for the sake of entertainment and narrative flow, certain aspects were fictionalized or adapted. The overall framework of the story is based on the experiences of the von Trapp family.
It is to an extent. The core events and characters have roots in reality, but for the sake of cinematic presentation, certain aspects were likely embellished or adapted.
The Sound of Music has elements inspired by real events. The von Trapp family's experiences formed the basis, but some artistic liberties were taken for the sake of entertainment and storytelling.