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Cyclic Redundancy Check (CRC)
An error detection and correction method.
You will find 'CRC' sections within a data packet such as an Ethernet packet.
A simple way of checking if an error has occurred within a data packet is to see if all the bits add up to an even (or odd) number. This is called 'parity checking'. This is fine, but a CRC goes further and is able to detect more than one error within a packet.
CRC makes use of complex mathematics to create a 'checksum'. This 'checksum' is used to detect and correct errors.
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Click on this link: Cyclic Redundancy Check
2020-10