And, the slightest change to the file's contents even by a character or pixel will drastically change its checksum. You can try this in practice by recalculating the checksum of your altered file.

If you are getting the Checksum error when trying to extract a RAR archive file using WinRAR, see this post and fix the error.

A checksum is a string of characters which uniquely identifies afile, a digital fingerprint. Change even a few bytes of a file–forexample, by infecting it with a virus or replacing an old ...