The process of calculating and using checksums to verify that data has not been corrupted or altered.
From checksum with the -ing suffix indicating ongoing action. Belongs to computing terminology that developed rapidly after 1960s programming.
Checksumming is why you can download a 10GB file and be absolutely certain every single byte arrived correctly—mathematicians and computer scientists built an elegant system that catches errors so reliably it's almost magic.
Complete word intelligence in one call. Free tier — 50 lookups/day.