What does "OST" mean in a movie?!

Question: What does "OST" mean in a movie!?

it's usually like "name of the movie" OSTWww@Enter-QA@Com

Answers:

"Original Sound Track," I think!.Www@Enter-QA@Com

"Dan F" is right!.!.!. it's Original SoundTrackWww@Enter-QA@Com

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