[SOLVED] What is the meaning of CRC?

In a sketch discoverOneWireDevices I found
"if ( OneWire::crc8( addr, 7) != addr[7])".

I can find the library but where stands the abbreviation for?
What says the program line?

Cyclic redundancy check

This is not a tutorial.

Please ask a mod to move this topic.

in the source code: