A mechanical keyboard is a type of keyboard that uses mechanical switches instead of membrane switches. They are often used for gaming, programming, and other tasks that require frequent typing because they provide better feedback and tactile feel.

"Rollover" refers to a keyboard's ability to correctly recognize the functions of all keys when multiple keys are pressed simultaneously. In traditional membrane keyboards, pressing multiple keys at once may cause some keys to be ignored or incorrectly recognized, a phenomenon known as "ghosting."

Mechanical keyboards typically have two types of rollover technologies: N-key rollover (NKRO) and partial (or limited) rollover (KRO).

Partial rollover (or limited rollover) keyboards, also known as "6KRO" or "8KRO" keyboards, can only recognize a limited number of keys that are pressed simultaneously, depending on the keyboard's designed KRO value. If more than KRO keys are pressed simultaneously, some keys may be ignored or not recognized correctly.

Full NKRO keyboards can recognize all keys on the keyboard simultaneously, regardless of how many keys are pressed at once. These keyboards typically require special hardware and software support and are therefore more expensive than KRO keyboards.

In summary, N-key rollover (NKRO) and partial (or limited) rollover (KRO) are two common rollover technologies used in mechanical keyboards, which ensure that the keyboard can correctly recognize all key functions when multiple keys are pressed simultaneously.

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