the.com/proofreading

means The act of carefully checking written text for errors in spelling, grammar, and fact before it goes out into the world.

from From 'proof,' the printing-house term for a trial copy pulled from set type so errors could be caught before the full run — originally 'proof' itself comes from Old French 'prove/preuve,' meaning a test or trial, same root that gives us 'prove.' So a 'proof' was literally something to be tested, and reading it to find its flaws became 'proofreading' by the 19th century, a straightforward trade-shop compound rather than anything fancier.