Used to identify a specific person or thing observed by the speaker.
The book [that] I read was interesting.
This is the house [that] Jack built.
I like the car [that] is red.
Asking for information specifying one or more people or things from a definite set.
My car, [which] is red, is parked outside.
The book, [which] has a blue cover, is on the table.
We visited the museum, [which] was very crowded.
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