used before a noun to ask or talk about one or more people or things chosen from a known group
Which movie would you like to watch tonight?
Which way is the train station?
used without a following noun to ask about or refer to one or more people or things chosen from a known group
Two cakes are on the table; which is for me?
The jackets look similar—which is yours?
used to introduce a clause giving extra information about a thing or group of things just mentioned
She lives in a house which overlooks the sea.
The dog, which was rescued as a puppy, is now healthy and happy.
