The standard US keyboard is a 101 key layout. To this was added the "windows" buttons which bring the standard up to 103.
Many new keyboards also come with special hotkeys which may be bound to any number of applications or commands.
Keyboards, nowadays, usually have 107 keys.
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A piano has 88 keys while a more expensive keyboard will have about 75 or so. A more standard cheaper one has about 50 or less.
On a standard computer keyboard it is 103 keys. If you wanted to know how many on a piano there is 88 keys.
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