The keyboard form factor is the physical shape of the keyboard. It determines the size and the amount of keys on the keyboard.
A **Full sized keyboard** is the most common keyboard you will see in the mass market. It is the preferred keyboard for people who do a lot of data entry.
A Tenkeyless keyboard (TKL), is basically the full sized keyboard without the number pad.
The 75% keyboard is a compact version of the TKL. It usually has the arrow keys displaced in such a manner it forms a smaller frame.
65% keyboards go one step further by removing the function keys at the top.
<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/312b7a63-bbca-4261-a5a9-ed6c3728870a/face.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/312b7a63-bbca-4261-a5a9-ed6c3728870a/face.png" width="40px" /> If this is the first time you are building a keyboard I highly recommend you start with a 60% or a 65%. Anything larger then that would immediately double in price.
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Then we have the 60% keyboards that are basically the 60% without arrow keys. They are the most common size for custom keyboard builds which makes them the easiest to find parts for.
