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If you mean literal fingers (human phalanges), they are used for entering data into the computer and controlling the computer.

"Finger" is also the name of a network protocol, though not a very secure one since unencrypted personal data is sent.

Then there are what people call "gold fingers" which are circuit board traces, pins off of chips, and other "gold" pieces of computer scrap. They are used to make electrical connections inside of computers. In reality, they don't contain a lot of gold and take many of these pieces to make an ounce.

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