What is a writing sample screenplay?

It can also be just a couple of pages, included in a pitch, when someone wants to see your writing style.

victortiti89 said:

I've read that spec screenplays are used as writing samples. What does it mean for a screenwriter? What type of screenplays can be used/are accepted as writing samples?

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All "spec screenplays" are used as writing samples. What that means for a
script writer is they use their spec screenplay to show producers their writing
talent. All types of screenplays can be used/are accepted as writing samples.

As Filman mentioned, some producers or agents ask for a "sample" rather than
the entire script. That usually means just a few pages so they can learn about
the writers talent, skill and style.