Techniques used in Titanic (1997 film)?!

Question: I am looking for some of the film techniques used in the film.
I am particularly interested how it starts in 1997 then travels back in time. I don't really know how to explain it properly or if there is a name for that technique.

thanks

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Answers: I am looking for some of the film techniques used in the film.
I am particularly interested how it starts in 1997 then travels back in time. I don't really know how to explain it properly or if there is a name for that technique.

thanks

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non-linear narrative
flashback

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