What is the purpose of express card slot in my laptop?

What does the ExpressCard34 slot do? expresscard_34 slot ExpressCard slot Which of the following types of cards can you install into that slot? A ExpressCard54 only B ExpressCard34 and ExpressCard54 C pyramid valley power zones slot Apiotek eSATA II 300 ExpressCard Adapter for NotebookLaptop Express Card Slot

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