An MD5 sum is a string of letters and numbers that acts like a fingerprint for a file. If two files have the same MD5 sum, the files are exactly alike - which is why MD5 "fingerprints" can verify ...

MD5 File And Folder Comparator Lite ($16; free, feature-limited demo) is a useful tool for doing two slightly-different tasks: Verifying that two versions of a single file are byte-for-byte identical, ...