How would you use vectors in a real life situation when making programs using vectors

closed account (96b9y60M)
I just learned about vectors in c++ and want to know what ways can we use a vector in a real life situation when making programs in c++.
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LOL is this a serious question?
I never use anything else.
To make a collection of items that has an unknown size at compile time or a collection with a non-constant size at run-time.
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